Rob gave you some good advice. It realy depends on if you want a mechanical or fixed blade head ( at least with those choices) I have found penetration of both heads to be very close, but for me I like a fixed blade head better, so the Muzzy would be my first choice. Both heads will do the job with a well tuned bow and good shot placement.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS