In the past I was able to tune 3 blades better than 4 blades, but maybe it was just me. 3 or blade either one will do the trick as long as they fly well. Personally I do not see much advantage with the extra blade, have not lost a deer yet using the 3 blade.

Remember a couple heads a while back that used 6 blades? Field testing by some and in actual hunting conditions proved the extra blades were not benificial.