My favourite would have to be David Tennant, he just embodies everything that the character should be.
Then afterwards comes....
Christopher Eccleston Tom Baker Patrick Troughton Peter Davison Paul McGann Jon Pertwee William Hartnell Sylvester McCoy Colin Baker
The two at the bottom I don't like that much, Colin Baker was arrogant annoying and had a weird outfit and Sylvester McCoy was also annoying and he was the Doctor when it got cancelled.
I don't know about Matt Smith yet, I know I'll grow to like himm, I think its too early to make judgement, he's only been the Doctor for a minuto so far. Like when Christopher Eccleston regenerated into David, it took me a while to warm up to him, but he blew me away and I think Matt will too. He won't be as good as David, never, but he will be good.
Matt Smith is the best doctor, hands down. He is the most brilliant and amazing actor for the part of the Doctor. Sure, David Tennant was great. He was a brilliant doctor too but he can't capture the role of the doctor like Matt Smith Can :)
I think all Doctors where brilliant ^^ my favourites in order: 1/ Matt Smith: 11 2/ Tom Baker: 4 3/ Christopher Eccleston: 9 4/ David Tennant: 10 5/ Colin Baker: 6 6/ Jon Pertwee: 3 7/ Peter Davison: 5 8/ Paul McGan: 8 (I swear I didn't do that on purpose) 9/ Sylvester McCoy: 7 10/ Patrick Troughton: 2 11/ William Hartnell: 1
My favourite Doctor is David Tennant (I just like him, he's like a "cheerful spirit" :]) and then Tom Baker (our Fourth Doctor always will be our Fourth Doctor)
I think that Matt will be so good as the Doctor (I can't judge him, I've only saw some trailers and the regeneration of 10th to 11th and I must say that I was so sad because we won't see mais chapters of David as the Doctor but I liked the first segundos of Matt as the Doctor)
David Tennant. My BFF thinks he's sexy, so maybe I'm just going with that answer (cuz she's standing right here!). I also REALLY like Matt Smith. He seems like a really nice, insane man. I envy Amy Pond. She also rides in the TARDIS.