I'd say, see who you're more comfortable with! It sounds like the internist is a person who really cares. That can make all the difference in the world -- extensive training can never teach a person to be warm-hearted, and many studies have shown that the relationship you have with your therapist is probably the most important factor in getting better. Besides, the internist will have regular contact with a supervisor who can help him sort out anything he doesn't know how to handle.

Go with your gut!