I think the "best" is very relevant to the age your imagination let you think bigger than poop/eat/sleep/play.
For me the end of John Pertwee into Tom Baker and on was the best time, Tom Baker for me is the best Doctor of them all. DT and Eccleston were very very good but so was Peter Davidson Colin baker was okay, McCoy dreadful. he was the death knell. Matt Smith was too odd, too quirky and couldn't "get" his Doctor.
Now I'm a huge fan of Peter Capaldi and I think he'll grow into the role as it progresses, DT wasn't wonderful from Ep1. Can't wait to see it!!!