A great watch does more than tell time—it can enhance your style and make you feel good. The best smartwatches can do even more. They connect to your smartphone, send notifications, and let you make phone calls from your wrist. You can also use apps for things like meditation, timers, weather updates, and more.The Apple Watch Series 9 is the best choice for iPhone users. It runs on WatchOS and has many apps to keep you from having to pull out your phone.