http://www.xbox.com/en-US/games/backwardcompatibilitygameslist.htm
There's the compatibility list. All of them are there (They start with "Tom Clancy's"). From reviews the Xbox ones seemed to play and run the best. I'd say the best ones (in order) are Chaos Theory, Stealth Action Redefined, Pandora Tomorrow and then Double Agent. I didn't like Double Agent at all - it was way too different than the other ones and not in a good way. When they showed Conviction a few years ago when Sam was emo I all but gave up on the series until they showed Conviction this E3. It looks like it could challenge Chaos Theory for the top spot in the series.
I'd say the only comparable series gameplay wise is MGS but even that's a fair stretch. MGS feels very clunky because of Snake's animations during gameplay. SC is a lot smoother and Sam will change his stance based on what you're doing. Sneaking up on a soldier from behind? Sam will reach for his blade. I prefer the SC games more gameplay wise as they're quite intense. You could be hanging upside-down on a pipe right above of a guard and he's just whisteling away - it's quite brilliant.
Here's a vid comparing all 3 versions of Chaos Theory: http://www.youtube.com/watch?v=HkHoDEh0FWc
