Smartphone Comparison: Samsung Galaxy S21 5G vs. Xiaomi Redmi A3x
1. Specifications Comparison
Design
| Feature | Samsung Galaxy S21 5G | Xiaomi Redmi A3x | Practical Impact |
|---|---|---|---|
| Dimensions | 151.7 × 71.2 × 7.9 mm | 168.4 × 76.3 × 8.3 mm | S21 is significantly more compact and easier to handle one-handed. A3x is larger and may be less pocketable. |
| Weight | 169g | 193g | S21 feels lighter and more comfortable for extended periods, while A3x feels heavier, particularly after extended use. |
| Build | Gorilla Glass Victus front | Gorilla Glass 3 front | S21 provides superior screen protection from scratches and drops, leading to better durability over time. A3x has less protection. |
Display
| Feature | Samsung Galaxy S21 5G | Xiaomi Redmi A3x | Practical Impact |
|---|---|---|---|
| Size | 6.2" | 6.71" | A3x offers more screen real estate for media consumption and gaming. S21 is more compact. |
| Resolution | 1080x2400 | 720x1650 | S21 provides sharper, crisper images and text. A3x will appear less detailed, especially when viewed closely. |
| PPI | 421 | 268 | S21 has significantly higher pixel density making images look more refined. A3x might show pixelation. |
| Technology | AMOLED | IPS LCD | S21 has vibrant colors, deeper blacks, and better contrast. A3x has less vivid colors. AMOLED is superior for dark mode battery efficiency. |
| Refresh Rate | 120Hz | 90Hz | S21 provides smoother animations and scrolling, making the user interface feel more responsive. A3x is less smooth. |
| Brightness | 1300 nits | 0 nits | S21 offers excellent outdoor visibility even in bright sunlight. The A3x's brightness is unknown, making it a potential weakness, especially outdoors. |
Performance
| Feature | Samsung Galaxy S21 5G | Xiaomi Redmi A3x | Practical Impact |
|---|---|---|---|
| Chipset | Exynos 2100 (5 nm) | Unisoc T603 (22 nm) | S21 offers significantly faster processing speeds, leading to smoother multitasking, quicker app loading, and better performance in demanding tasks. A3x will struggle with heavy tasks. |
| AnTuTu Score | 749,100 | 239,000 | S21 demonstrates superior performance across various tasks. A3x is considerably slower for all applications. |
| GPU | Mali-G78 MP14 | Mali-G57 MP1 | S21 provides vastly superior graphics performance suitable for graphically intensive games and apps. A3x is adequate for basic tasks. |
| RAM | 8 GB | 3 GB or 4 GB | S21 offers smoother multitasking, better ability to keep apps in memory and is more future-proof. A3x may experience slowdowns. |
Camera
| Feature | Samsung Galaxy S21 5G | Xiaomi Redmi A3x | Practical Impact |
|---|---|---|---|
| Main Camera Resolution | 12MP | 8MP | S21 captures more detailed images in good lighting conditions. |
| Main Camera Aperture | f/1.8 | f/2.2 | S21 has a wider aperture, which is better in low-light conditions. |
| Telephoto/Portrait Camera | 64MP | Not Available | S21 offers telephoto and portrait capabilities, allowing for optical zoom and depth effects. A3x does not have these features. |
| Selfie Camera Resolution | 10MP | 5MP | S21 captures sharper and more detailed selfies. |
| Wide Angle/Macro Camera | 12.2MP | Not Available | S21 can capture wide angle shots and macro close ups. The A3x cannot do either. |
| Video Recording | Up to 8K@24fps | Up to 1080p@30fps | S21 records high-resolution videos, making it suitable for video content creation. |
| Video Stabilization | Yes | No | S21 has electronic image stabilization for smoother videos. A3x will be prone to shaky video. |
| Slow-motion | Yes, 960 fps | No | S21 can capture high speed slow motion. A3x has no slow motion. |
| DxOMark | Mobile: 111 (photo 118, video 90), Selfie: 132 (photo 125, video 145) | Not Available | S21's photo and video performance are rated with real world tests, which is not available on A3x. |
Battery
| Feature | Samsung Galaxy S21 5G | Xiaomi Redmi A3x | Practical Impact |
|---|---|---|---|
| Capacity | 4000mAh | 5000mAh | A3x likely provides longer battery life due to larger capacity. Actual endurance can vary based on usage. |
| Charging | 25W Fast Charging | 10W Fast Charging | S21 charges significantly faster, reducing downtime. |
| Charging Features | 15W Wireless, 4.5W Reverse Wireless Charging | None | S21 offers wireless charging options. |
2. Key Differences Analysis
Samsung Galaxy S21 5G Advantages:
- Superior Display: AMOLED panel with higher resolution, higher pixel density, better brightness, and 120Hz refresh rate offers an exceptionally better viewing experience for all content.
- Significantly Better Performance: The Exynos 2100 chipset provides much faster processing speeds and smoother multitasking capabilities than the Unisoc T603.
- Advanced Camera System: The S21 features a triple-camera system with a telephoto lens and 8K video recording, offering more versatility and superior image quality than the A3x's basic dual-camera setup.
- Faster Charging & Wireless Charging: The S21 supports faster wired and wireless charging, as well as reverse wireless charging.
- More Advanced Features: Has more sensors like barometer and a better security fingerprint scanner.
Xiaomi Redmi A3x Advantages:
- Larger Battery: The 5000mAh battery provides potentially longer battery life, which is good for users who prefer battery over other features.
- Newer OS: Ships with Android 14, which means longer software support, security updates and more features compared to Android 11 on the S21.
- Larger Screen: Offers a larger 6.71" display which might appeal to users who prioritize screen size for media consumption.
- Potentially Lower Price: Likely positioned as a more budget-friendly device than the S21.
Significant Trade-offs:
- Samsung Galaxy S21 5G: Trades off battery capacity for premium features and performance. May require more frequent charging for heavy usage.
- Xiaomi Redmi A3x: Trades off performance, display quality, and camera capabilities for larger battery and potentially lower price. Offers a basic smartphone experience.
3. User Profiles & Recommendations
Samsung Galaxy S21 5G:
- Ideal User: Performance-focused users, mobile gamers, photo/video enthusiasts, individuals who value a premium display and overall smoother and faster experience.
- Use Cases: High-end gaming, professional photography and videography, smooth multitasking, media consumption, demanding app usage.
- Value: Offers a premium experience but comes at a higher cost. Worth it for users who prioritize the best possible performance and screen.
Xiaomi Redmi A3x:
- Ideal User: Budget-conscious users, individuals who prioritize long battery life and a larger screen for media consumption, basic smartphone users who do not need high performance or advanced cameras.
- Use Cases: Casual browsing, social media, basic photography, watching videos, long-lasting phone use without needing to charge it.
- Value: Offers a budget-friendly option with a large battery and screen. A good value if you prioritize long battery and a low price.
4. Decision Framework
Key Questions for Buyers:
- What is your budget? The S21 is significantly more expensive than the A3x.
- What are your performance needs? If you value smooth performance, fast loading, and gaming capabilities, the S21 is the better choice. If you only use your phone for basic tasks, the A3x may suffice.
- What features do you value most? If you want a high-quality display, an advanced camera, and faster charging, the S21 is better. If you want long battery life and a larger screen the A3x is a better option.
Scenario-Based Recommendations:
- Scenario 1: High-Performance & Multimedia: If you frequently play demanding games, edit videos, or want the best display for media consumption, the Samsung Galaxy S21 5G is the clear choice, despite its higher price tag.
- Scenario 2: Budget & Battery Focused: If you want a larger screen, long battery life, and a low price is your primary concern, the Xiaomi Redmi A3x is the better option.
- Scenario 3: Balance: If you want a more balanced approach, prioritize the performance and camera of S21 or prioritize the battery and bigger screen of the A3x depending on your needs.
My Choice:
Given my priorities, I would choose the Samsung Galaxy S21 5G. While the Xiaomi Redmi A3x offers a larger battery and a larger display, the S21's superior performance, significantly better display, and more advanced camera system are more crucial for my needs. The difference in experience with these two devices is immense and for me, the S21 delivers a better overall user experience despite it being older. The S21's premium features, smoother performance, and better display are well worth the additional cost, especially as it is a high-performance powerhouse that is still very relevant today.
