Ah yes this is a tough question to answer because the line between Nine and Ten is very very fine. So fine its almost invisible but I have to go with Nine. A) because he was my first doctor, B) because you can see how very much in love he was with Rose. He didnt hide stuff as much as Ten did. C) he was so obviously broken and you could see the joy Rose gave him as he healed. Ten is so brash and adorable but Nine despite his gruffness remains the one on top of my list.