I own both a Galaxy SIII and an iPhone 5 (iPhone since iPhone 3 - 2nd Android, HTC Incredible about a month, and SIII is for testing - but I've tested idea of making it my primary phone and relegating iPhone to testing)
I agree that iPhone OS and hardware are inferior to the SIII. Tethering is unstable on the iPhone compared to the SIII. Thing is, I have a few pieces of software that I paid for and are really critical to how I work and live. There are some Android "substitutes", but I've yet to find good solutions. I'd pay $10 or $20 or more if I can find apps that worked, or better still, to buy a ported version.