I shoot both muzzy 4 blade and slick tricks, cant tell any difference other than the slick tricks blades being a little more durable.
With these blades i dont care which way the deers facing, ive smashed through quartering too shots with muzzy's exiting the hind leg. Talk about a deer not going far.

I know one mech not to use, its those cheapo eastmans you find at walmart. Had major failures with those. They crumple like a volvo front end and stop 2" in a deer.