I admittedly haven't tested the screen brightness on the iPhone, but the AMOLED screens the S3 and GNexus both use are REALLY bright, the test phone must've had the brightness setting turned down, because at full blast, it will hurt your eyes. It actually can function as a full blown flashlight with a blank white screen, some Android flashlight apps actually have that function available to use the screen as a flashlight instead of the camera flash. Only thing I'd be concerned with the One X is if you'll get stuck behind in the operating system updates. That's a problem I ran into with my previous Android phone, that when it finally updated to Gingerbread, it screwed up the phone (an HTC as well) and eventually made it unusable because the model really wasn't meant to run GB and they patched together a mod for it that wasn't good. I can't see that happening at any point with the S3 since it's their flagship model, I don't know much about the One, but be wary of that. That's the reason I got the GNexus, it's a Google-made phone, so the odds that Google's operating system won't work correctly on it are very, very low.