If you know you want an Apple Watch, but arent sure which one to get, this guide is here to explain the differences between the three models. The companys flagship Apple Watch Series 10 has robust fitness tracking and health monitoring, as well as helpful iPhone integrations. We named it the best smartwatch overall. The Apple Watch Ultra 2 packs a few extra features and is geared towards serious athletes and outdoor adventurers and its also the most expensive. The oldest model of the bunch is the budget Apple Watch SE from 2022, which you can often find on sale for under $200. It gives you a surprising number of features for the price. Check out the buying advice below to get the full story on the chips, sensors, features, battery life and price to help you pick the best Apple Watch for your wrist. Table of contents Best Apple Watch in 2025 What to look for in an Apple Watch How we tested Apple Watches Best Apple Watch in 2025 What to look for in an Apple Watch Chips and sensors The new Apple Watch Series 10 has an S10 SiP (system in a package) chip with a four-core Neural Engine. The Ultra 2 was updated last September with Apples S9 SiP. Both chips allow for on-device processing of Siri requests as well as dictation, translation, automatic workout detection and the Double Tap gesture that lets you answer calls or stop an alarm by tapping your thumb and forefinger together twice. It also enables faster machine learning performance for interpreting sensor data, speech recognition and performing other thinking tasks. The Apple Watch SE still relies on the S8 SiP, which was also used in the Series 8 and the original Ultra. Both the Series 10 and Ultra 2 can measure certain vital signs like heart rate, as well as take an ECG. Temperature sensors can help track ovulation, while underwater temperature sensors may come in handy while swimming and snorkeling. Both also support fall-detection and crash-detection as a safety feature. All three models have a compass and altimeter. The Apple Watch Ultra 2 has an onboard SOS siren, as well as dive features like a depth gauge. Water features were added to the Apple Watch Series 10, but with a shallower depth rating (just six meters, as compared to 40 meters on the Ultra). The Ultra includes blood oxygen sensors, but a patent dispute has forced Apple to disable that health feature on new models sold in the US and the hardware isnt present in the new flagship model. All three models support near field communication (NFC), the chip that enables Apple Pay. Once you set it up using the Apple Watch app on your iPhone, you can pay for stuff at any store that accepts Apple Pay, even if you don't have your phone with you. Displays and case sizes The wide-angle OLED display on the Apple Watch 10 lets you see the always-on display from more angles. The Ultra 2 also has an always-on display, but youll have to lift your wrist to tell time or read notifications on the SE. The SE can reach a maximum brightness of 1,000 nits, the Series 10 can get as bright as 2,000 and the Ultra 2 hits 3,000 nits. Both higher-end screens can dim to a single nit, making them less distracting in the dark. The Apple Watch Series 10 came with a new finish and case material a glossy anodized jet black finish on the aluminum model and the option for a titanium case. The Ultra 2 also got a new finish, satin black, that utilizes a PVD (physical vapor deposition) process to apply the color. As for case sizes, the SE is available in 40 or 44mm. The Series 10 increased in size from the prior generation and now has a choice of a 42 or 46mm case. The Ultra 2 comes in just one size measuring 49mm. You also get the opportunity to pick the length and style for watch bands. The SE and Series 10 come in small/medium or medium/large and the Ultra 2 gives you the choice of small, medium or large. The Series 10 (left) and Series 9 (right). Cherlynn Low for Engadget Battery life Since its the largest wearable, the Apple Watch Ultra 2 sports the biggest battery and can last for a claimed 36 hours on a charge. That number jumps up to 72 hours if you turn on low power mode. Both the Apple Watch 10 and the SE are rated by Apple to go for 18 hours before they need a visit to the charger, and longer when using battery saver mode. That means if you want to use either of those models regularly for sleep tracking, you may need to recharge them a bit before bed. Fitness and wellness features Believe it or not, all three Apple Watches have similar fitness tracker chops. The Activity app uses three rings to keep tabs on how much youre moving in a day: The Move ring tracks your active calories; the Exercise ring monitors the minutes youve spent walking, running, doing yoga and so on; and the Stand ring tells you how many hours in a day youve stood up and moved around for at least one minute. Different internal sensors detect those activities, for example the accelerometer senses when youre moving versus sitting still, and the optical heart rate sensor judges how hard you're working out and how many calories youve burned. You can set your goals for each ring and youll earn badges and animations when you hit them. The Workout app lets you start and track an exercise session. The sensors can even auto-detect when youre working out, tapping your wrist to suggest you track the activity. Apple Watches will integrate with Apples Fitness+ subscription, displaying real time heart rate and calorie burn data on your iPhone, iPad or even Apple TV 4K as you take a class. Fitness+ also includes audio-guided walks and runs with just your watch and Bluetooth earbuds. All three models support the Activity and Workout apps for free. The Fitness+ app also works with all Apple Watches, but costs $10 per month. New features enabled with watchOS 11 include Training Load that gauges your bodys response to workouts over time, which could help athletes better prepare for events like marathons. Users can also now skip a day (or more) from fitness tracking metrics when they need to rest or arent feeling up to the challenge of closing their rings. The new OS also supports offline maps, which could prove useful when hiking far from cellular coverage. Siri You can get the weather, start a workout, identify a song and dictate a text just by asking Siri. All Apple Watch models support the Raise to Speak feature that bypasses the need to say Hey Siri and will instead listen for your request when you lift your wrist near your mouth. Both the Series 10 and the Ultra 2 utilize onboard processing of Siri requests. That means executing simple requests like starting workouts and timers are quicker, as they wont need to access external networks. However, requests like sending texts or getting weather forecasts still need to communicate with Wi-Fi or cellular, so youll need to have your phone nearby if you have a GPS-only model. Carbon neutral options The Apple Watch Series 9 with the aluminum case was the company's first carbon neutral product. Apple defines its carbon neutral products as those that use "100 percent clean electricity for manufacturing and product use, 30 percent recycled or renewable material by weight and 50 percent of shipping without the use of air transportation." Combined, Apple says those changes reduced the emissions by around 75 percent, and the company will use credits so make up for the remaining emissions. Currently, the Apple Watch Series 10 in either aluminum or titanium with the sport loop band, braided solo loop or Milanese loop, and the Apple Watch Ultra 2 with the trail loop or alpine loop bands are designated as carbon neutral products. Price Theres a $550 difference between the cheapest and most expensive Apple Watches. For $250 (and often on sale for less), you can get the 40mm Apple Watch SE with GPS-only connectivity; adding cellular connectivity ups the price by $50. The Apple Watch Series 10 starts at $399 for the 42mm, non-cellular model in aluminum and goes as high as $749 for the 46mm titanium case (which is only available with GPS and cellular). The Apple Watch Ultra 2 has just one price: $799 for a titanium 49mm case with both GPS and cellular power. How we tested Apple Watches Engadget has been reviewing Apple Watches since the first one came out in 2015. Since then, weve tested every subsequent model Apple has released, including the Ultra and SE models, spending at least a few days or even a couple weeks with one strapped to our wrists. During that time, we run, hit the gym, go on hikes and wear it while sleeping, all the while gauging how it tracks various metrics, integrates with the iPhone and performs every other trick Apple claims its smartwatches can do. Since we also review smartwatches from other companies, such as Samsung and Google, our editors can compare Apple Watches not just to previous generations, but also to other wearables on the market. Our buying guides and recommendations rely on first-hand testing by Engadget staff.This article originally appeared on Engadget at https://www.engadget.com/wearables/best-apple-watch-160005462.html?src=rss