I don't have a favorite, I go with my guns favorite. When I get a new turkey gun I buy a bunch of different brands and sizes of both 3 and 3 1/2 and see what patterns the best. Right now one gun patterns great out to 50 yards with Winchester Supreme, 3 1/2 #4's, and the other 3 inch winchester 6's.
Any shot size will kill a bird, but the pattern is the key.
You have to make sure which one shoots the best with your gun/choke tube combo.
Ticklish Tom Custom Calls Prostaff
Mossy Oak Prostaff
Hips Archery Targets Prostaff
Dixieland Outdoors Prostaff