Damn it, man. I cannot make this decision between the Galaxy S3 and the One X.
I was able to find the SIII for $550 and the One X for $475. Relatively small difference in price. Here's a list of my pros and cons so far:
HTC One X:
Pros: Looks sleek, high quality build with matte finish, Sense UI blends seamlessly with native Android interface, and on board 32GB.
Cons: Battery is built-in (not replaceable), no MicroSD card slot, face buttons are touch-sensitive and not actual buttons.
Samsung Galaxy SIII:
Pros: MicroSD card slot, replaceable battery, noticeably better battery life, physical button on the front, supposedly superior software features.
Cons: Glossy finish, flimsy build quality (especially the back panel), overall not an appealing look (for me anyway), TouchWiz is a little wonky, and UI experience is not ideal (tries to hide Android).
Summary:
Basically, my main issue with the SIII is I think it looks fuckin' ugly (even when compared to its predecessor, the SII) but it has a major advantage by being a more modular phone with the MicroSD card slot as well as have a removable battery; a year or two down the road if the battery is not holding a charge, buy a new one. The SIII's battery life is a huge advantage as well.
The One X, on the other hand, looks much more elegant but is restricted by not having a card slot or a replaceable battery. Both phones have a decent UI experience with the One X having the edge of a much cleaner interface. The SIII though has some (perhaps gimicky) software features such as gestures (swipe hand on screen to take screenshot) and facial/eye recognition technology where it basically recognizes when you're looking at the phone, and of course some NFC and back-to-back phone transfer options. Funky, but not the hard selling points for me.
I'm not trying to rush this decision but the marked down prices I found are on a limited time offer (3 days), after which they both go back to $650 each.