The question of the best Doctor...
...is beyond question.
You may have a favourite, but the best Doctor was Tom Baker; he (and maybe Patrick Troughton) had the best mix of gravitas and mischief that is required.
Paul McGann and Peter Davison fall into the "too miserable" camp; Jon Pertwee, Colin Baker and Sylvester McCoy are in the "too silly" corner. William Hartnell I don't tend to judge, because I've only seen a couple of his stories.
The best story-arc, I think, was the Key To Time. It's no coincidence that this happened on Tom Baker's watch.
