Omitting Flash sizes - there is Nexus 4, Galaxy S4, HTC One and soon Moto X which Google will update like they do any other device they sell. Pretty good variety than iPhone models I'd say.
Key difference is you don't get the mostly similar 3 iPhones - you get 4 vastly different phones with meaningfully different feature sets - and they are even made by different companies. Way more variety and choice.
I bet all of the Google Play sold devices would see at least 2 major updates. (My Gnex got 4.1/4.2/4.3 - and unlike my iPad 3 ios 7 update, it actually got better at every update.) That's good enough for me considering that Android updates are really not the same as iOS updates - most apps including the Keyboard get updated independent of the OS.
