Well I'm an old school Traditional guy and like to keep it simple. I use a large 3/blade fixed head, heavy. With my equipment I want something with a lot of shock and knockdown power. Of course my bows are slower, but that is not necessarily a bad thing, my arrow rarely passes through the bird and helps with recovery if the bird does make it out of sight.
Basically use what you are used to and flies good out of your bow, you don't have to go buy something special for Turkeys. Just remember as with anything else, it's not the bow, it's not the arrow, and it's not the broad head, it's where you put the arrow that matters most.
Roy