I use one daily, an Apple Watch SE 1st gen. You need an iPhone to use the Apple Watch as far as I'm aware. I daily drive a Pixel 4a but I still keep an old iPhone SE 1st gen purely for this watch..
There might be Android apps that can interface with the Apple Watch but it certainly wouldn't be the full experience
Yeah, I'm really trying to find a tablet that is about 8 inches and has extremely smooth usage of web browsing and YouTube, that isn't an iPad mini (or Samsung, just don't like their UI), and it seems like nothing comes close anywhere in the industry, maybe with the possible exception of the Google Pixel Tablet. It feels like the entire industry gave up trying to innovate tablets because iPads were that good.