I think the Titan has the Super LCD screen. Those are about as good as Samsung's Super AMOLED in my opinion (not as bright, but close, and whites look a little better on the Super LCD since the Super AMOLED has a touch of gray to their white), but not really close to the Super AMOLED Plus screen that the Focus S is supposed to have (same as on the Galaxy S II). Again, this is just my opinion.
Downsides to Samsung (at least to me) are that updates appear to be a problem with them no matter the OS. The Focus has two hardware versions, and only one can get Mango officially right now. And they have a history of bad updates with Android (some rumors say that this is a carrier issue and that the international versions get updates in a timely manner, but you can't argue with the Mango issues). The other downside is that their hardware feels a bit cheaper. HTC makes a quality feeling phone. Heavier, solid, just feels a little better. Samsung feels lighter (which can be nice as well), and just very plasticy. Even the screen, though made of gorilla glass, feels like it could be plastic.