I never considered myself a Doctor who fan until I saw David Tennant in the show. He and the writers I guess, sparked my interest in the program. And I'm thoroughly Infatuated with Matt Smiths portrayal of the Doctor. The play against Him and Amy Ponds character is so much fun to watch. Mind you, I say this because I had hardly seen Doctor Who until Tennant's reign. I didn't know much about the show until the 2000's.
I knew little of Doctor Who back in the 70s. I only caught bits of shows and I recall being so confused that I gave up watching it. That is because it was on late at night and I only caught a glimpse of a show here and there. It is only recently that I have watched the classic episodes. I enjoy them very much. Most of bits of episodes that I saw in the seventies had Tom Baker as the Doctor in them. So, I place Tom as probably the most well known of the doctors.
As for Tom being the best of the Doctors, it is hard to make a proper account until I finish watching all the shows. Certainly all the actors brought life to the character and showed many different aspects of the Doctors personality. I think it was a brilliant concept to have the Doctor regenerate into a different man both in looks and character. That makes him so much more interesting. The writers and other powers that be certainly had their hand in the manufacturing of the Doctors character. It would have an impact on how some Doctors were viewed and received by the fans.
Despite all that I have seen of the episodes, old and new, I still think of Tom Baker when I think of Doctor Who. I cannot say why. I do not know why. I only know that I do. Maybe that is because he is indeed the best Doc of all.