Theoretically there may be a slight advantage in applying as a 2 ball, as every alternate tee time that a two ball gets picked on may get filled with another two ball. But, in my opinion, it doesn’t make a significant difference what size your group is. All successful cards are drawn at random from the same pile so if your card gets picked and you are a three or four ball you will be allotted the next available tee time and if you are a two ball, you may be allotted two remaining slots on an earlier tee time or the next available tee time.