Being able to change the default apps and layout the home screen any way I like, including using a completely new launcher, are big pluses for me. Being able to drag and drop music and files directly onto my device is another. Running real Firefox and not a Safari wrapper is a big deal too IMO.

I also find Android notifications and the Google keyboard way more ergonomic than on iOS and third party keyboard support on iOS is still pretty buggy.

But the real kicker is being able to side load apps when necessary. I didn't like the idea of giving Apple complete control over what I can run on my phone when they first announced the App Store and I still don't like it and consider it a serious threat to the future of general purpose computing.