iPhone 11 vs Samsung Galaxy S21 - Complete Review
iPhone 11 vs Samsung Galaxy S21 - Complete Review & Comprehensive Buying Guide
When navigating the secondary smartphone market or looking for high-value mid-range options, the battle often comes down to two titans: the iPhone 11 and the Samsung Galaxy S21. While they were released two years apart, their current pricing in the refurbished and new-old-stock market places them in direct competition. This is not just a comparison of specifications; it is a clash of ecosystems, display philosophies, and long-term usability.
The iPhone 11 represents Apple’s last flagship with an IPS LCD screen and rounded edges, offering a gateway into iOS at an accessible price point. The Galaxy S21, conversely, brings 5G connectivity, a high-refresh-rate OLED display, and a versatile triple-camera setup. This technical analysis digs deep into the architecture, thermal performance, and real-world value proposition of both devices to help you decide which hardware deserves your investment in 2024 and beyond.
Expert Opinion Snapshot
Before diving into the granular benchmarks, here is the executive summary for the pragmatic buyer. The decision largely hinges on whether you prioritize display technology and 5G (Galaxy S21) or battery consistency and video recording stability (iPhone 11).
- iPhone 11 Winning Edge: Superior standby battery life, class-leading video stabilization, and the A13 Bionic chip which still outperforms many mid-range Androids today. It uses an LCD screen, which means zero PWM flicker—a crucial factor for users with sensitive eyes.
- Samsung Galaxy S21 Winning Edge: The 120Hz Dynamic AMOLED 2X display is generations ahead of the iPhone 11. It also features a dedicated telephoto lens for optical zoom and native 5G support, making it more future-proof regarding connectivity.
Expert Insight: Many reviews overlook the modem difference. The iPhone 11 is strictly a 4G LTE device (Intel modem). The S21 utilizes the Snapdragon X60 (or Exynos equivalent) 5G modem. If you live in an area where carriers are refarming 4G bands for 5G, the S21 will have significantly better reception and data speeds.
Full Technical Specifications
To understand the hardware disparity, we must look at the raw architectural differences.
| Feature | iPhone 11 | Samsung Galaxy S21 5G |
|---|---|---|
| Display Tech | 6.1" Liquid Retina IPS LCD, 60Hz | 6.2" Dynamic AMOLED 2X, 120Hz |
| Resolution | 828 x 1792 pixels (~326 ppi) | 1080 x 2400 pixels (~421 ppi) |
| Processor | Apple A13 Bionic (7nm+) | Snapdragon 888 / Exynos 2100 (5nm) |
| RAM | 4GB LPDDR4X | 8GB LPDDR5 |
| Biometrics | Face ID (3D Structured Light) | Ultrasonic Fingerprint (Under Display) |
| Build Material | Glass Front/Back, Aluminum Frame | Glass Front, Plastic Back, Aluminum Frame |
Ergonomics, Build & Materials
The ergonomic experience differs drastically between these two handsets. The iPhone 11 feels substantial and premium but slightly dated. It utilizes a glass back and rounded aluminum rails. However, the bezels surrounding the LCD screen are noticeably thick, and the device is wider (75.7mm), making one-handed use challenging for smaller hands.
The Galaxy S21 introduced Samsung's "Glasstic" (reinforced polycarbonate) back. While purists might miss the cold touch of glass, the matte plastic finish is more durable against drops and resists fingerprints significantly better. The S21 is narrower (71.2mm) and lighter (169g vs 194g), making it far more comfortable for extended usage. The "Contour Cut" camera housing on the S21 also provides a more modern aesthetic compared to the iPhone's square camera bump.
Performance, Thermals & Gaming
This is where the generational gap should be evident, but the reality is nuanced. The iPhone 11 runs on the A13 Bionic (7nm+). Despite its age, the A13's single-core performance remains competitive. iOS optimization allows the 4GB of RAM to feel snappy, though apps will reload more frequently in the background compared to modern flagships.
The S21 sports the Snapdragon 888 (US/China) or Exynos 2100 (Global). Both are 5nm chips with immense power. However, the Snapdragon 888 is notorious for running hot. Under sustained loads like Genshin Impact or PUBG Mobile, the S21 is prone to thermal throttling, dimming the screen and reducing frame rates to manage heat.
The 120Hz Factor: Regardless of raw benchmarks, the S21 feels faster. The 120Hz refresh rate makes scrolling and UI animations appear twice as smooth as the iPhone 11’s locked 60Hz panel. Once you experience 120Hz, it is difficult to go back.
Camera Capabilities
Photography is a major divergence point. The iPhone 11 uses a standard Wide and Ultra-Wide setup. The S21 adds a crucial third element: Telephoto.
- Daylight Photography: Both excel here. The S21 tends to saturate colors (greener grass, bluer skies), making photos "social media ready" straight out of the camera. The iPhone 11 aims for natural, warmer tones and realistic contrast.
- Zoom Capabilities: The S21 wins effortlessly. Its 64MP sensor allows for a 3x hybrid optical zoom that retains detail. The iPhone 11 relies entirely on digital crop, resulting in noisy, muddy images past 2x zoom.
- Video Recording: The iPhone 11 remains the king of video in this comparison. The stabilization, dynamic range transition, and microphone quality are superior. While the S21 boasts 8K video, it is largely a gimmick with severe crop and rolling shutter. For 4K/60fps vlogging or content creation, the iPhone 11 is the more reliable tool.
Battery Endurance & Charging Speeds
Battery life is not determined by mAh alone. The iPhone 11 (3110 mAh) benefits from the lower resolution, 60Hz LCD screen, and lack of 5G. In real-world mixed usage, the iPhone 11 often outlasts the S21. The standby time on the iPhone is exceptional, losing very little charge overnight.
The Galaxy S21 (4000 mAh) struggles with the energy demands of the 120Hz screen and 5G modem. Heavy users will likely need a top-up by late afternoon. However, the S21 supports 25W charging (faster than iPhone's typical 18W/20W speeds) and offers Reverse Wireless Charging—allowing you to charge earbuds on the back of the phone, a feature the iPhone lacks.
Market Value Guide (New vs Used)
Pricing fluctuates wildly in the secondary market. Below is an estimated value guide for 2024/2025.
| Condition | iPhone 11 (64GB) | Galaxy S21 5G (128GB) |
|---|---|---|
| Refurbished (Excellent) | $200 - $240 | $210 - $250 |
| Used (Good) | $150 - $190 | $160 - $200 |
| Value Retention | High | Moderate |
Pre-owned Inspection Checklist
If you are buying used, these specific hardware failures are common for each model. Use this checklist before handing over cash.
| Test Area | iPhone 11 Specifics | Galaxy S21 Specifics |
|---|---|---|
| Screen | Check for "True Tone" in settings. If missing, screen was replaced cheaply. | Check for OLED Burn-in. Open a pure white image and look for ghost icons (keyboard/status bar). |
| Biometrics | Test FaceID. If it fails, do not buy. It is often irreparable. | Test Fingerprint sensor. Screen protectors can interfere, but sensor failure is rare. |
| Battery Health | Settings > Battery > Health. Avoid if under 80%. | Dial *#0228# to check battery status logic (requires technical know-how). |
Top Alternatives Comparison
If neither of these fits your exact needs, consider these close competitors:
- Samsung Galaxy S20 FE (Fan Edition): Often cheaper than the S21. Offers 120Hz and similar cameras, but has expandable MicroSD storage (which S21 lacks).
- iPhone 12 Mini: If you want 5G and OLED in the Apple world but have a tight budget. Warning: Battery life is significantly worse than iPhone 11.
- Google Pixel 6a: A newer mid-ranger with a better camera for still photos than both the S21 and iPhone 11, running pure Android.
Critical Advice
For the iPhone Buyer: Be aware of the "Unknown Part" messages in settings. Since iOS 15, Apple notifies users if screens, batteries, or cameras have been replaced with non-genuine parts. While they may work, they lower the resale value significantly.
For the Samsung Buyer: The S21 does not have a MicroSD card slot. If you shoot 4K video, the 128GB base model will fill up quickly. Opt for the 256GB version if you plan to keep the phone for more than two years. Also, ensure you buy a "Unlocked" version (U1 in USA) to avoid carrier bloatware.
Final Verdict
The choice between the iPhone 11 and Samsung Galaxy S21 is a choice between reliability and modernity.
Buy the Samsung Galaxy S21 if: You consume a lot of media and need that beautiful 120Hz OLED screen, you live in a 5G area, or you require optical zoom for photography. It is objectively the more advanced piece of hardware.
Buy the iPhone 11 if: You are on a budget but need access to iMessage/FaceTime, you prioritize video recording quality for social media, or you have PWM sensitivity and cannot tolerate OLED flickering. It remains the most cost-effective entry point into the Apple ecosystem that is still usable in 2024.