I actually like Sergio... a bit. I think when he's closer to 30 and nicely polished, he'll come across a lot different.
I do agree he comes across as pretty abrasive right now. But at least you know where he stands. Sometimes I get the feeling Phil could be stabbing you in the back with a divot tool and he'd still have that thin lined, uber-goofy grin on his face. (don't get me wrong, I am a big Phil fan... not a 'Phil-phanatic' but still a Phil fan.)
But for my favorite... I still have a soft spot for Vijay. I still say his work ethic is second to none, he takes nothing for granted, and has a great swing. Considering his background, I think his life has been pretty impressive.
Surprisingly, in recent months I've really grown fond of watching/listening to Luke Donald. A soft spoken, intelligent sounding, classy golfer, with a very skillful game. You just aren't seeing that kind of class/skill ratio in younger golfers that much these days.