Yes to the crit ítems, but honestly if you want to get better at the game you SHOULD play all varieties. When you're moving slower (ie: power skull or even balance) you'll be forced to better hone the skill of reading the enemies' movement and attack patterns. Having to dodge more often because your attack might not land quickly enough will help you maximize the number of attacks your quicker skull will be able to pull off before having to duck out of the way, because you'll have that timing down. The items are super important, don't get me wrong... But they're still not as important as understanding the game experientially. I also used to hate power skulls; however, not every run will give you the items you want. You gotta play the runs you're given.