Trust me, I used Thunderhead 125's for 2 years and in my own opinion they don't compare to the bone-busting power of Muzzy's. I personally don't know of any blades that can go thru the deer and dig into the ground, and come back perfectly sharp enough to use again.
I just had a pass through yesterday with a 125 (think it is a thunderhead but I'm not sure) and pulled the arrow from the ground about 20 yards beyond where I hit the deer. Blades are still very sharp and straight - can't even tell I used it. Maybe this is an anomaly though? I am currently experimenting with Muzzy 100's but haven't been in the woods with them.