If you have an iPhone, the Apple Watch is the best wearable to go with it. But what's the best Apple Watch to buy? The current model is the Apple Watch Series 10, but are last year’s Series 9 and Ultra Watch 2 still worth it? Check out our breakdown of WatchOS 26 and our other relevant buying guides, including the Best Smartwatches, Best Fitness Trackers, and Best iPhones. Updated August 2025: We added new information on blood oxygen sensing, WatchOS 26, and the upcoming Series 11.