The girls at my kids' gym almost all compete Yurchenkos, but rumor has it that the vault coach may start experimenting with Tsuks. I sure hope the rumors are right, because DD is very blocked on her Yurchenko right now, but I think she could get there if the pressure were off and she could just take however much time is necessary to get it back. The rationale as I understand it is that while the Tsuk may be a little easier to get as a simple tuck/pike/layout, once the Yurchenko technique is mastered, it's an easier vault for the girls to build up into twists. But this is all hearsay.
The boys do a bigger variety. DS's L8 and L9 teammates last season competed Yama****as, Tsuks, and I think at least one Yurchenko. Can't remember if there were any fronts beyond the Yamis. But I'm not yet all that good at identifying the variety of upper level vaults, since I only have one child training them! I just hope that if the plan is for my son's group to compete Yurchenkos when they are 9s, they start the preliminary drills really early, as the gym does with the girls. Scary Yurchenkos are scary!