How to choose a smartwatch (2026)
By the Let’s Compare Editorial Team · 2 min read · 5 things that matter · Updated November 2026
Short answer: Check compatibility first, because a smartwatch that doesn't fully work with your phone is a poor buy at any price. Then choose between rich smart features with nightly charging and a multi-day battery that suits sleep tracking and workouts. Pay for the health sensors you'll use, and skip features tied to an ecosystem you're not part of.
Your phone decides more about which smartwatch to buy than any spec does. Watches are tightly bound to your phone and your habits, so the right pick is personal. Once the platform is settled, the sections below explain each spec, its weight in our 0–100 score and what's typical across the watches we track.
What matters most, and how much
| Factor | Weight in our score |
|---|---|
| Battery | 26% |
| Health & fitness sensors | 22% |
| Display & build | 14% |
| Payments, LTE & extras | 11% |
| Compatibility | 6% |
How much each factor moves our 0–100 smartwatches score.
Torn between the top two? See our head-to-head: Garmin Fenix 9 Pro vs Huawei Watch GT 6 Pro →
Compatibility: settle this before anything else
Before anything else, make sure the watch fully works with your phone. Some are effectively iPhone-only or Android-only, and a few lose features (replying to messages, for example) when paired across ecosystems. Your phone brand narrows the field quickly, and staying within one ecosystem usually gets you tighter integration: notifications, payments and apps that just work. The rest of this guide only applies to watches your phone supports.
Weight in our score: 6%See the best for this →
Health & fitness sensors: pay for what you'll use
Sensors are where watches differ most, and our score weights them heavily. Every watch measures heart rate. Beyond that, 74% of the watches we track add an ECG (for atrial-fibrillation checks), 95% measure blood oxygen, and some track skin-temperature trends. Runners and hikers should care about GPS accuracy: dual-band/multi-band GPS (63% of ours) holds a truer track among tall buildings and trees. Think about which of these you'll really use, because clinical-style sensors you ignore are wasted money.
Weight in our score: 22%See the best for this →
Battery: the everyday dealbreaker
Battery life defines what a watch is like to live with, and it carries a lot of weight in our score. The full smartwatches we track average 50 hours, often a day or two, so you'll be charging frequently and that gets in the way of sleep tracking. Fitness-focused and outdoor watches stretch to many days or even weeks. So decide what you value more: rich apps and a bright always-on display (95% have one), or leaving the charger at home. Both an always-on screen and LTE cut endurance noticeably.
Weight in our score: 26%See the best for this →
Display & build: readable, comfortable, durable
You need to read the screen at a glance in sunlight, so brightness and an always-on option count for more than resolution. On smaller wrists, case size and weight decide comfort, and you won't wear an oversized watch to bed. Choose the build for your life. Swimmers and outdoor types should look at tougher cases, sapphire glass and higher water resistance; slimmer, lighter designs suit everyday and dress wear.
Weight in our score: 14%
Payments, LTE & extras: the daily conveniences
These small features are the ones you'll use constantly. Contactless payments (NFC) turn the watch into a wallet. LTE, offered by 59% of ours, lets the watch call, text and stream without your phone, which is handy for runners but costs battery and a monthly plan. On-board storage plus a speaker and mic enable offline music and calls from your wrist. Pay for them only if they fit how you'll use the watch.
Weight in our score: 11%
Frequently asked questions
Which smartwatch works with my phone?
Check before you buy. Some watches are effectively iPhone-only or Android-only, and a few lose features when paired across ecosystems, so your phone brand narrows the field fast.
Are smartwatch ECG and SpO2 sensors accurate?
ECG features on some watches are regulator-cleared for atrial-fibrillation checks. Treat the other wellness sensors as trends rather than diagnoses, and be aware that legal disputes can get features disabled.
How long do smartwatch batteries last?
Full smartwatches often need charging every day (Apple rates about 18 hours), while fitness-focused watches stretch to days or weeks. You're choosing between rich features and endurance.
Explainers for this guide
- Smartwatch health sensors explained: ECG, SpO2 and GPS
What the sensors measure, which claims are regulator-backed, and how platform lock-in can switch a feature off.
- Why some smartwatches last a day and others last weeks
An Apple Watch needs charging nightly; a Garmin can go weeks. The screen and the software explain most of it.
Sources & further reading
Every figure above is computed from our own catalogue. The general technical claims are backed by the independent references below (some from non-English outlets), so you can check them yourself.
- Garmin Fenix 7 Pro In-Depth Review: Flashlight and Multiband for Everyone! — DC Rainmaker
- ECG app and irregular heart rhythm notification available today on Apple Watch — Apple Newsroom
- Apple Watch Series 10 Tech Specs — Apple
- Los últimos Apple Watch se quedan sin SpO2 desde hoy: la prohibición se reactiva en Estados Unidos — Xataka (ES)
Ready to compare?
The figures in this guide are computed live from the 39 smartwatchesin our catalogue and update as it grows. Analysis by the Let’s Compare Data Engine.