I think any good 2,3 or 4 blade head will do a good job. It's not the head but where you put it that's most important. I never heard of the Dixie Cup either, most folks call it the wing butt.
But I don't agree that's the best shot on a Turkey. If you miss just a little forward or back its guts or just breast meat. Both birds will run forever and you'll never find them. My recovery rate went way up when I started taking shots through the back.
You can set your decoys up where you can get this shot everytime, you just have to be patient and let the bird turn.
RW