I use iOS on my iPod Touch 4th Gen. However I'm contemplating getting a HTC One instead of an iPhone 5 because of the greater storage. Only snag is how much money I've spent on iTunes (mostly music, all DRM-free I think, I didn't get it for a while after my brother did). Android looks cooler, but iOS7 looks like it's going to change all that. Sure, there'll not be the customisation, but I'm not sure I need too much of that.