I just dumped a Capitvate Glide for my One X. The One X's battery has been excellent, and the screen is drool-worthy. I have had zero multi-tasking problems and actually prefer the pseudo-WebOS setup that HTC uses. TouchWIZ just didn't impress me, and I especially don't like the lack of flexibility (the buttons in the notification area taking up space, I'd rather use widgets and shut those off...plus you pretty much have to commit to dark themes to preserve battery on an AMOLED screen...color saturation is real nice but LCDs are pretty close).
I do wonder why HTC didn't put in a memory card slot but I can live with 16 GB, and I carry a MicroUSB battery pack around, since that'll charge my phone, tablet OR eReader.
BTW, the camera sensors in the HOX and the S3 are exactly the same, and the same as the one on the iPhone4 from what I hear. HTC includes a dedicated imaging co-processor.
The Samsung is a nice design, but it's partially designed to ape the iPhone, which instantly turns some off. I also don't like the feel of their materials, and these peel-off battery "doors" are starting to make me nervous. I could probably use a GS3, but I prefer the HOX. I wonder how the ATRIX3/DROID HD will stack up, too, should be a direct competitor.