Overall the OS is a real work in progress although the phone as hardware and the phone/texting UI is fine. But the apps are half-baked for the most part. WP email is extremely primitive compared to the native android email app. Most of the enthusiast programs are amateurish and with poor aesthetics although a few do a good job of emulating and syncing with Google calendar and Gmail. The independent Youtube alternatives are adequate if again not as good as the native app on android. All this is to be expected and I wouldn't bring it up in a thread that was completely oriented toward WP but you specifically asked for comparisons so . . .
The thing I miss most from android is the very well integrated sharing between android apps. Not just easy sharing to email, Facebook, Twitter etc. but Pocket (which doesn't exist on WP), Evernote (which does and it's pretty good, but nothing shares to it), Bookmarks, Dropbox etc. With WP you're lucky if you get email or Facebook. For example the otherwise excellent Bing News (by Microsoft of course) has no sharing options whatsoever. It's like Microsoft has yet to discover the Internets.
Ok, rant off. I love the phone but more for Nokia than MS. And for the record I own no Apple products, haven't for years, and this is my first smartphone. But I have three android tablets I use constantly and I'm very fond of. So if this phone weren't half the price of a Moto G, I'd have the Moto G.