I've used stock Android, and yes, I'd call it buggier than iOS. It's much less fluid and apps often just stop responding completely. It's not terrible, but in my experience it's just been worse than iOS overall.
7.1, I believe? I guess you can't call it stock, since it was LineageOS 14.1, but it's close enough. If you're being picky I've used actual "stock" Android Marshmallow and it's had the same issues.
