It really depends on how your rig shoots and what grain you have been practicing with. You need to match your field point grain to your broadhead grain. I personally have shot thunderhead 125's for the last 15 years and have never had a problem with penetration or durablity. The other plus is you can find the replacement blades at any smalltown bowshop or hardware store , everyone carries the thunderhead. If you have a buddy or someone who switchs broadheads all the time maybe you could borrow a few different makes and grains and see what shoots the best for you. Remember to shoot your broadheads as they may fly a little different than your field tips do, better to find out at the range than in the woods.