On the one hand, this is an incredibly easy question to answer. As the dutiful Whovian fangirl that I am, I of course would chose to speak with The Doctor.
Now comes the hard part. Do I have to chose just one incarnation of The Doctor, and if so, how can I possibly choose? That is like asking someone to pick their favorite kind of cheesecake. The correct answer is, obviously, all of them. But, if I had to pick one single incarnation for The Doctor, I would pick Ten.
Why would I pick Ten? Scottish accent, fabulous hair, great fashion sense, fabulous hair, that mischievous smile, did I mention the hair? And when he puts those glasses on, well, he could read me the Scottish phone directory while eating a haggis sandwich and I would ask for an encore.
The Doctor is constantly changing the outcome of points in time that are not fixed, meaning unable to be changed. If fixed points in time were no issue, what is the one thing he would go back and change, without a second thought to the consequences?
Throughout his existence, The Doctor has had numerous companions, most human, but not all. Which of his companions has been his favorite, and why?
But the most important question any girl can ask The Doctor, of course it.... can I come with you?