He was Fantastic! (get it?)

Christopher Ecalston was Fantastic!! But David Tennant is Brilliant!

it's eccleston and i love him

Best moment ever: he sits down in the Big Brother chair, faces the camera, and says, "You have got to be kidding me."

This is a really hard choice because they were both brilliant, and Eccleston deserves serious props for being the doctor to start it all up again. The one thing I didn't prefer so much was that Eccelston was a bit too aggressive and yelling all the time, whereas Tennant was a bit more kooky.

I think they were both brillant but I loved Tennant right away. He hook me to Doctor Who when, shame on me, I had given up with Eccleston's doctor after a couple of episodes (episodes that I ironically love now).
So I would say Tennant, but Eccleston was bloody fantastic too.