I personally think that they both filled the role in different but brilliant ways. Both Smith and Tennant brought unique and fun quirkiness to the Doctor. My first doctor was Matt Smith, and then I wanted to go back and watch the stories behind it, which spoiled a little but I was really glad I got to see 9-11. So I know this is a debate but I like both of them about equally.
One Two Three Four I declare a time war
Five Six Seven Eight Daleks scream "EXTERMINATE!"
Nine Ten Eleven Twelve The Doctor died and Silence fell
Twelve Eleven Ten Nine There he goes back in time
8 7 6 5 Saving everybody's lives
Four Three Two One Grab her hand and whisper"Run"
This post could be a bit more SONIC, you think?