David Tennant. I watched every season with David Tennant but only watched one episode with Matt Smith and have never watched another one again, he's just not the same. Matt also looks incredibly weird.
i love matt smith but i think david tennant was better. i think the problems with the latest doctor are down to russel t davies leaving and the writing now... even though steve moffat wrote some of the best episodes back in the day he's just not doing a good job as head writer..
I tried watching the Matt Smith episodes but just couldn't get into them. I question though whether that is because of the poorly-written story lines or Matt Smith himself. A combination of the two I think.
David Tennant was always going to be a very tough act to follow but I think Matt Smith has done brilliantly so far. As for who's better, I really don't know. I prefer Matt Smith's character in a way, he comes across as arrogant at times which is something that never happened with David and I think it fits the super-intelligent alien persona much better. So I prefer Matt Smith's character, but I don't really have a preference when between the actors themselves.
Btw, does anyone know when the show is coming back?