Thunderheads are some of the best broadheads out there. I have bow hunted for 26 years and used alot of broadheads. Placement is more important than broadhead, so I recommend whatever flys good for your setup. My favorite is the old Wasp Cam Locks, but I have a stockpile of the Wasp Hi-Techs too. (chisel point is a little better) Muzzy are very good, and even Cabela's has some darn good points for the budget minded.
I shot an overdraw for 3 or 4 years with the expanding blade type broadheads. They worked too, and they did fly perfectly. However, I did not like how the light arrows and expanding blades did not always go all the way through. I like exit holes for better blood trails.
Enjoying the Outdoors.
IaCraig