I went to the AT&T store determined to turn in my Focus S and get a Titan.....and I couldn't pull the trigger. I got some extended hands on time with the phone (no one else around that wanted to mess with it), so a few things I noticed:
1. Phone looks gorgeous and feels awesome in the hand. The build quality seems superb, way better than my Focus S, but it is hefty and probably too big for my hands (I have average-sized hands). It also felt way too heavy, but that's probably because the Focus S is absurdly light.
2. The camera is undoubtedly better than the one in the Focus. I took several pictures side by side and the HTC Titan snapped the pictures quicker and each shot looked better than the Focus S. The Titan did have a reddish/pink hue overall though, so the pictures came out with "warm" tones compared to the Focus S. The Focus S seemed truer to the original colors, although it had a bluer, colder tone to its pics. But overall, this is a landslide, and until/if Samsung releases software updates to the Focus S, it won't compete with the pics on the Titan.
3. The screen on the Titan, while not AMOLED, was still nice. But when compared to the SAMOLED Plus screen on the Focus S, it just looked washed out and dull. Its crazy, because it looks great on its own, but the minute I put my phone next to it, the SAMOLED Plus just plain outclassed it. Which is probably the biggest reason I didn't pull the trigger on the trade. I even encountered another hardware anomaly last night (screen flicker) on the Focus S, and I'm having growing doubts about the quality of the phone, but that screen simply cannot be beat.
So there's my brief Focus S vs. Titan debate. Depending on what's important to you, I think either is a solid choice. Also, keep in mind that I've found some faults with the Focus S, but if I had spent the past week with a Titan instead, I'm sure I'd find some bugs and faults there as well, so this isn't an entirely fair comparison. The reviews on Engadget and other tech sites would never delve into the stuff I've found on the Focus S.