If you have your equipment tuned right, you should not have to every shoot your broadheads. Ive been hunting with every bow type made, for over 30 years and have never shot broadheads except at animals. If you bow is tuned, your arrows spined right and head tuned, they will group just like you field points.
But to answer your question, pretty much all mechanicals work on similar principals, pick what you like and go to town. Just stear clear from spiral cuts. They suck.