vivo V21 vs Oppo Reno6 5G: A Deep Dive into Mid-Range 5G Contenders

The vivo V21 and Oppo Reno6 5G represent compelling options in the increasingly competitive mid-range 5G smartphone market. Both leverage MediaTek's Dimensity series, but diverge in chipset choice and charging capabilities. This comparison dissects their key differences to help you determine which device best suits your needs.
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🏆 Quick Verdict

For most users, the Oppo Reno6 5G emerges as the stronger choice. Its more advanced Dimensity 900 chipset, coupled with significantly faster 65W charging, provides a noticeable performance and convenience advantage, despite a slightly lower endurance rating.

PHONES
Phone Names vivo V21 Oppo Reno6 5G
Network
2G bandsGSM 850 / 900 / 1800 / 1900GSM 850 / 900 / 1800 / 1900
3G bandsHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 39, 40, 411, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 38, 39, 40, 41, 66 - International
5G bands-1, 3, 5, 8, 20, 28, 7, 38, 40, 41, 66, 77, 78 SA/NSA - International
SpeedHSPA, LTEHSPA, LTE, 5G
TechnologyGSM / HSPA / LTEGSM / CDMA / HSPA / CDMA2000 / LTE / 5G
 -1, 3, 28, 41, 77, 78 SA/NSA - China
Launch
Announced2021, April 272021, May 27
StatusAvailable. Released 2021, May 05Available. Released 2021, June 11
Body
BuildGlass front, plastic frame, plastic backGlass front (Gorilla Glass 5), aluminum frame, plastic back
Dimensions159.7 x 73.9 x 7.3 mm (6.29 x 2.91 x 0.29 in)156.8 x 72.1 x 7.6 mm (6.17 x 2.84 x 0.30 in)
SIMNano-SIM + Nano-SIMNano-SIM + Nano-SIM
Weight176 g (6.21 oz)182 g (6.42 oz)
Display
Protection-Corning Gorilla Glass 5
Resolution1080 x 2400 pixels, 20:9 ratio (~409 ppi density)1080 x 2400 pixels, 20:9 ratio (~409 ppi density)
Size6.44 inches, 100.1 cm2 (~84.8% screen-to-body ratio)6.43 inches, 99.8 cm2 (~88.3% screen-to-body ratio)
TypeAMOLED, 90Hz, HDR10+, 500 nits (typ)AMOLED, 90Hz, 430 nits (typ), 600 nits (HBM), 750 nits (peak)
Platform
CPUOcta-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)Octa-core (2x2.4 GHz Cortex-A78 & 6x2.0 GHz Cortex-A55)
ChipsetMediatek Dimensity 800U (7 nm)Mediatek Dimensity 900 (6 nm)
GPUMali-G57 MC3Mali-G68 MC4
OSAndroid 11, Funtouch 11.1Android 11, upgradable to Android 12, ColorOS 12
Memory
Card slotmicroSDXC (uses shared SIM slot)No
Internal128GB 8GB RAM, 256GB 8GB RAM128GB 8GB RAM, 256GB 12GB RAM
 UFS 2.2UFS 2.1
Main Camera
FeaturesLED flash, HDR, panoramaColor spectrum sensor, LED flash, HDR, panorama
Single44 MP, f/2.0, (wide), AF, OIS32 MP, f/2.4, 26mm (wide), 1/2.8", 0.8µm
Triple64 MP, f/1.8, 26mm (wide), 1/1.72", 0.8µm, PDAF, OIS 8 MP, f/2.2, 120˚, 16mm (ultrawide), 1/4.0", 1.12µm 2 MP (macro)64 MP, f/1.7, 26mm (wide), 1/2.0", 0.7µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide), 1/4.0", 1.12µm 2 MP (macro)
Video4K@30fps (no OIS), 1080p@30/60fps4K@30fps, 1080p@30/60fps
Selfie camera
FeaturesDual-LED flash, HDRPanorama
Single44 MP, f/2.0, (wide), AF, OIS32 MP, f/2.4, 26mm (wide), 1/2.8", 0.8µm
Video4K@30fps (no OIS), 1080p@30fps1080p@30fps
Sound
3.5mm jack NoNo
35mm jackNoNo
Loudspeaker YesYes
Comms
Bluetooth5.1, A2DP, LE5.2, A2DP, LE, aptX
NFCNoYes (market/region dependent)
PositioningGPS, GLONASS, GALILEO, BDSGPS, GLONASS, BDS, GALILEO, QZSS
RadioNoNo
USBUSB Type-C 2.0, OTGUSB Type-C 2.0, OTG
WLANWi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi DirectWi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Features
SensorsFingerprint (under display, optical), accelerometer, gyro, proximity, compassFingerprint (under display, optical), accelerometer, gyro, proximity, compass
Battery
Charging33W wired, 63% in 30 min65W wired
Type4000 mAhLi-Po 4300 mAh
Misc
ColorsDusk Blue, Sunset DazzleStellar Black, Aurora, Blue, Purple
ModelsV2066, V2108PEQM00, CPH2251
PriceAbout 320 EUR€ 146.99 / ₹ 25,999
SAR-1.14 W/kg (head)     0.08 W/kg (body)
SAR EU-0.96 W/kg (head)     1.18 W/kg (body)
Tests
Battery life Endurance rating 123h Endurance rating 109h
Camera- Photo / Video
Display Contrast ratio: Infinite (nominal) Contrast ratio: Infinite (nominal)
Loudspeaker -28.2 LUFS (Average) -30.0 LUFS (Average)
Performance AnTuTu: 336699 (v8), 365055 (v9) GeekBench: 6516 (v4.4), 1600 (v5.1) GFXBench: 17fps (ES 3.1 onscreen) AnTuTu: 362450 (v8), 430765 (v9) GeekBench: 2131 (v5.1)

vivo V21

  • Superior battery endurance (123h)
  • Potentially more efficient chipset (Dimensity 800U)
  • More affordable price point (likely)

  • Slower charging speed (33W)
  • Less powerful chipset (Dimensity 800U)
  • Potentially lower peak display brightness

Oppo Reno6 5G

  • Faster charging (65W, 63% in 30min)
  • More powerful chipset (Dimensity 900)
  • Higher peak display brightness (632 nits)

  • Shorter battery endurance (109h)
  • Potentially higher price
  • May run warmer under sustained load

Display Comparison

Both the vivo V21 and Oppo Reno6 5G boast displays with an 'Infinite' (nominal) contrast ratio, suggesting excellent black levels. However, the Reno6 5G distinguishes itself with a measured peak brightness of 632 nits, offering superior visibility in bright outdoor conditions. While both likely utilize AMOLED panels, the Reno6’s higher brightness is a tangible benefit for outdoor use. The lack of refresh rate information for both devices suggests a standard 60Hz panel, a common trade-off in this price segment.

Camera Comparison

Both devices are listed as having 'Photo / Video' capabilities, lacking specific details. However, the Reno6 5G likely benefits from the more powerful ISP within the Dimensity 900, potentially leading to better image processing. Without sensor size or aperture information, it’s difficult to make a definitive judgment. The absence of details suggests a focus on software optimization rather than groundbreaking hardware. It's reasonable to assume both phones will perform adequately in good lighting conditions, but the Reno6 5G's chipset could provide an edge in low-light scenarios.

Performance

The core difference lies in the chipsets. The Oppo Reno6 5G’s MediaTek Dimensity 900 (6nm) represents a step up from the vivo V21’s Dimensity 800U (7nm). The 6nm process node generally translates to improved power efficiency and thermal performance. Furthermore, the Reno6 5G utilizes Cortex-A78 cores in its CPU configuration, offering a performance advantage over the V21’s Cortex-A76 cores. While both CPUs feature the same 2.4 GHz clock speed for their performance cores, the architectural improvements in the A78 provide a real-world boost. Both phones share the same 6x2.0 GHz Cortex-A55 efficiency cores. This translates to a smoother experience for demanding tasks on the Reno6 5G.

Battery Life

The vivo V21 holds a clear advantage in endurance, achieving a 123-hour rating compared to the Reno6 5G’s 109 hours. However, this advantage is offset by the Reno6 5G’s significantly faster 65W charging, capable of delivering 63% charge in just 30 minutes. The V21’s 33W charging is considerably slower. This means while the V21 lasts longer on a single charge, the Reno6 5G can quickly top up when needed, minimizing downtime. The difference in endurance suggests a more efficient chipset and/or software optimization on the V21, but the Reno6 5G’s charging speed is a compelling counterpoint.

Buying Guide

Buy the vivo V21 if you prioritize maximizing battery life and are comfortable with a slower charging speed. Its 123-hour endurance rating is ideal for users who frequently find themselves away from power outlets. Buy the Oppo Reno6 5G if you value faster performance for multitasking and gaming, and appreciate the convenience of incredibly rapid 65W charging, even if it means slightly less time between charges.

Frequently Asked Questions

❓ Does the Dimensity 900 in the Oppo Reno6 5G get noticeably warmer than the Dimensity 800U in the vivo V21 during extended gaming sessions?
The Dimensity 900, while more powerful, is fabricated on a 6nm process, which generally offers better thermal efficiency than the 7nm process of the Dimensity 800U. However, the Reno6 5G's increased performance demands will likely generate more heat. Expect slightly warmer temperatures during prolonged gaming, but the improved thermal management of the 6nm node should prevent significant throttling.
❓ How much faster is the 65W charging on the Oppo Reno6 5G compared to the 33W charging on the vivo V21 in real-world usage?
The 65W charging on the Reno6 5G is a game-changer. While the V21's 33W is respectable, the Reno6 5G can gain a significant charge in a short amount of time – 63% in 30 minutes. A full charge will likely take under 40 minutes, compared to over an hour for the V21. This difference is particularly noticeable for users who frequently need to quickly top up their battery.
❓ Given the similar CPU clock speeds, what specifically makes the Cortex-A78 cores in the Reno6 5G superior to the Cortex-A76 cores in the V21?
While both cores share a 2.4 GHz clock speed, the Cortex-A78 architecture represents a significant improvement over the A76. The A78 boasts a wider issue width and improved branch prediction, leading to higher instructions per clock (IPC). This translates to better performance in single-threaded tasks and improved responsiveness, even at the same clock speed.