Ability score generation
Starting level is whatever, to me. The higher we start, the longer it takes to level, and the slower the sense of progression. For that reason, I enjoy starting at 1. However, most games start at 1, and it's a lot of the same kind of stuff over and over to get to 2 and then 3, so even though you have "more" progression, it's not always the most thrilling. Level 3 lets everyone start with their subclass, which is one of its main draws.
Whatever the DM has in mind is fine with me, though. If we're taking a vote on that too, I guess I can pick a side, but I'm seriously good with whatever.