It doesn't take a genius to see:
SGS3: Butt Ugly Plastiphone
iPhone 5: Not a Butt Ugly Plastiphone
Yes it's vain. Most things in life are. Even if you cede that the sgs3 does more crap, it's still just lipstick on a pig. I feel that everything "extra" is likely useless to me anyway.
Anyway, I like having the nicer looking things in life. Sometimes it doesn't even involve sacrifices. My car doesn't tow 10000 pounds, but I don't need it to. It also doesn't seat 8. Ask me if I care?
Phones are personal preference. Even still, you can dress up the ugly girl all you want with "features", it won't make me want it.
If it wasn't made of plastic and didn't feel like it, then we could talk UX. Until then I have no reason to even start looking elsewhere.
If you did a "which phone is better built/feels more "premium"" comparison between the iPhone and the entire Android lineup SGS3 included, it would be no contest. Apple knows that counts. Samsung doesn't .
Vain? Yep. But last I checked, the pretty girls in reality usually get preferential treatment. People hate that I'm right, but the SGS3 in my mind is the equivalent of the pretty girls ugly cousin (who's a bit portly, but might know a few more useless facts and have a bit more "storage space")...
Yippee!