watchOS
When it comes to looking at why the Apple Watch reigns supreme among smartwatches, you can’t overlook the operating system. While watchOS may not be perfect, it’s almost certainly objectively better than the Android-based alternatives.
It’s really gotten to the point where even Android users and fans are noting the “sad state” of Google’s own Wear OS (formally known as Android Wear but rebranded in 2018). While there may be more wear OS options than Apple Watch models, if the OS isn’t any good, then the hardware isn’t going to matter as much.