Upgraded to a 3G-S. didn't bother to jailbreak. Didn't miss it. Have run iOS primarily ever since.
Dabbled with Android on a HTC One and Samsung Galaxy S3. Noticed that many apps do not scale to the screen properly. Encountered folder bug on HTC One (created a folder in the launcher I could not delete until updating firmware). Noticed bug in alarm clock - didn't wake me up. Noticed scrolling was less smooth than my 3-4 year old iPhone from 2008. Constantly annoyed with the UI and crappy email program.
Didn't find anything to hold me to the platform and the UI was annoying. Handset quality was not as good - the S3 feels like a plastic child's toy, and the buttons on the bottom of the HTC one are awkward to use with one hand.