Driver. I'm pretty new to the sport (last year was my first time watching a full F1 race) so I've flipped a few times on who I enjoy watching and pull for. I really like Hamilton from the get go but now I think he's a pre-madonna. I cant stand Vettel. I do like Button and Weber but I find myself rooting most for Alonso. The job he did last year was amazing ... I believe he'a way better driver, in it's purest form, than Vettel. I also like Massa just because of the story.. psychology plays a huge part in any sport. Coming back from the head injury is impressive.
Last year I probably rooted for Massa harder than anyone, only because Alonso was always in the front anyway, so he didn't need my help as much :P