Looking for an honest Apple Watch SE 2 40mm vs Casio G-Shock GBM-2100 comparison in 2026? We scored both smartwatches on the same six-dimension framework — performance, battery, display, camera, design and value — using identical methodology, so the numbers below are directly comparable. In our overall scoring the Casio G-Shock GBM-2100 comes out ahead 37/100 to 49/100 — a 12-point gap. The widest gap is in battery life, where the Casio G-Shock GBM-2100 pulls noticeably ahead. On price the Apple Watch SE 2 40mm undercuts the Casio G-Shock GBM-2100 by 87% ($107 vs $200), which materially changes the value calculus for budget-conscious buyers.
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Casio G-Shock GBM-2100 edges out the Apple Watch SE 2 40mm in the smartwatches category, especially in battery life (300h vs 18h battery), scoring 49 vs 37. If you want the better overall smartwatches, Casio G-Shock GBM-2100 is the recommended choice.
Picking Casio G-Shock GBM-2100 over Apple Watch SE 2 40mm means trading these off.
✓ Pros
✗ Cons
✓ Pros
✗ Cons
| Spec | Apple Watch SE 2 40mm | Casio G-Shock GBM-2100W |
|---|---|---|
| Display | 1.78"✓ | 1.2" |
| Display Type | LTPO OLED | — |
| Resolution | 368 x 448 pixels | — |
| Chipset | Apple S9 SiP | — |
| OS | watchOS 11 | — |
| Heart Rate | Optical HR 24/7 |
Buy Apple Watch SE 2 40mm if…
Choose the Apple Watch SE 2 40mm if budget is your top priority — it offers competitive specs at a lower price point.
Buy Casio G-Shock GBM-2100 if…
Buy the Casio G-Shock GBM-2100 if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Casio G-Shock GBM-2100 edges out the Apple Watch SE 2 40mm in the smartwatches category, especially in battery life (300h vs 18h battery), scoring 49 vs 37. If you want the better overall smartwatches, Casio G-Shock GBM-2100 is the recommended choice.
No, Casio G-Shock GBM-2100 scores higher (49 vs 37).
Apple Watch SE 2 40mm is cheaper at $107 vs $200 for the Casio G-Shock GBM-2100.
Choose the Apple Watch SE 2 40mm if budget is your top priority — it offers competitive specs at a lower price point.
Buy the Casio G-Shock GBM-2100 if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Casio G-Shock GBM-2100 lasts longer with 300 hours vs 18 hours for the other.
Apple Watch SE 2 40mm has the larger display (1.78" vs 1.2").
Reviewed by VersusMatrix Editorial Team
Last updated: May 10, 2026
Methodology: AI-powered analysis of technical specifications from manufacturer data. Scores are calculated by comparing products across multiple dimensions and normalized relative to the full category database. Our editorial process is independent and not influenced by affiliate partnerships.
Scores are relative within the smartwatchescategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
| — |
| SpO2 | Yes (blood oxygen) | — |
| ECG | Yes (FDA approved) | — |
| GPS | Yes | — |
| Workout Modes | Multiple modes including swimming | — |
| Swim Proof | 50m water resistance | — |
| Battery Life | 18hrs | 300hrs✓ |
| Bluetooth | Bluetooth 5.0 | — |
| NFC | Yes | — |
| Case Material | Aluminium | — |
| Water Resistance | WR50 | — |
| Weight | 33g✓ | 51g |
| Price | 107$✓ | 200$ |
Apple Watch SE 2 40mm is lighter at 33g vs 51g.