I prefer iOS on my cell phone and Android on my tablet. I really do enjoy and appreciate both platforms near equally. iOS has a better selection of apps and the software seems more sound, but Android is fun to tinker with and aesthetically more pleasing with the widgets and customizations/themes/roms, etc. Of course iOS has jailbreaks, which I partake in as well.
I think Android is best on a bigger device which is why I picked up a Nexus 7 rather than a iPad mini. I picked up a 5S for my phone because iPhones are straight forward and I only call/text on my phone, for browsing and media consumption I love my Nexus 7.
Again, I prefer both. I could see myself getting an Android phone one day, they are becoming more and more pleasing to me and now that I've learned Android from my Nexus 7, I find it very enjoyable. But at the same time, I love having both platforms at once.