Both are great watches and you cant go wrong with either. Me personally? I would choose the 30 hands down. Two extra complications yeah, however, the case on the 30 I think is much nicer, closer to the classic 011. It just speaks to me a lot more than the 10, question is which speaks to you?
Congrats on the choice, what a great, hard choice to make!! There is no wrong answer,
One more item to think about, which should not be that much of a determining factor is this. You will see a lot fewer 30's out there than 10's. And should you one day decide to part with it, there are fewer 30's than 10's. I know we are not supposed to talk about that and I am not going to use the "I word" but there is that.
Good luck and let us know which you decide.