I have to say ham if I have to choose between the two choices that you've given here. I don't like turkey very much at all, in fact, if I'm able to avoid turkey at Thanksgiving, I will do that as well.
If I could choose from anything to eat that I've ever been served for Christmas Dinner, I think that I probably would choose cold lunch meat sandwiches. The reason that I would make that decision is that is what we always had for Christmas dinner when I was growing up.