[Galaxy S III Q&A, (US Carriers)] PMad:
I bought the HTC One X and held onto it for 29 days, then returned it for the SGS3 (which i preordered a couple weeks before it came out).

I liked many things about the HTC One X. The screen quality was a little bit better on the HOX, but its smaller. The SGS3 uses a pentile display, which means that even at the same resolution as the HOX, you can still see the pixels, but its something that most people wont notice. The SGS3 is seems like its a little bit brighter than the HOX too, but not enough that the average phone user would ever even notice the difference.

They both have the same processor, but the SGS3 has 2GB ram vs the 1GB ram on the HOX. Now most people wont notice a difference with the RAM, but for all that multitasking, it really does help! Oh speaking of multitasking, the HOX cant do it and the SGS3 can! If you go to the task list on the HOX and click on a screenshot of a program you had open, it is what it is.. just a screenshot... The HOX literally runs the program again rather than holding it in memory, so you never get to keep your position when multitasking...

When it comes to audio, the HOX stock is definitely better with Beats Audio, and the phones speaker seems to have a little better sound as well, but it wasnt as loud as my GS3 is.. When it comes to headphones or streaming to your car stereo, or even your in home stereo, the HOX is definitely better, but for the SGS3 and even the HOX, you can download equalizers from the play store that brings the balance back to the SGS3 when compared to the HOX. Also, the device you have it connected too probably has its own equalizer or somewhat of one that helps as well.

Memory is a huge issue on the HOX, you have 16GB and nothing but 16GB. If you want or need more, too bad... SGS3 has the MicroSD slot so you can expand up to 32GB (or was it 64?). And for giggles, you could carry multiple microsd cards with you if you wanted!

Battery was ok on the HOX, and its significantly better on the SGS3, especially with bloatware removed and an active task killer (i've always had great luck with these, i dont understand how some dont see a difference?). I typically get around 20 hours with medium use of my SGS3, but my HOX would have to be plugged in by the end of the day, or by bedtime if i barely used it...

Speaking of the battery, the day i got the phone, it froze on me... Every possible combination of buttons and hooking it upto the computer in every possible way, running certain programs, adb, nothing would reboot the phone or turn it off.. Ended up waiting over 7 hours for it to die after i spent 3 hours trying to shut it off. I can not live without a removable battery!!! F U HOX! Anyway!

Overall, i think the SGS3 is a better phone. Not MUCH better, just better. The LED light is bigger, brighter, and the ear piece speaker doesnt block the it like the HOX. The battery is bettery, the removable battery and external storage is a huge plus, but the HOX's screen is barely better, has better stock audio, and Sense 4.0 is definitely better than Touchwiz, BUT!!! I dont use either... I typically install Apex or LauncherPro and use one of them. The HOX has a nicer looking lock screen, but the SGS3 lock screen features and the way it works is much nicer.. I prefer the watery stuff over the orb thing. And i like being able to say "Hi Galaxy" or whatever i choose to unlock it hehe

When it comes down to the decision, your not really caring about custom roms and things like that, so your decision should come down to the size of the phone. The SGS3 is bigger, but has a bigger screen, and with a case is even bigger. The HOX is smaller and has a smaller screen. Feel them both in your hands, and play with the screens. It wont take you long to decide which you prefer. Either way, if i were you i'd go with the SGS3 because if you decide in the future to root and install custom rom's, you'll have much less of a hassle with SGS3 than the HOX.