For me the question isn't how many blades, but rather how well does it fly. I place more importance on not having to change my scope. If you need to change your scope from field points to broadheads, then your broadheads aren't flying correctly in your bow.
To me the optimum flight is attained when the broadhead flys exactly as a field point.
We are getting that with the G5 Striker and the Red Hot Crosspro 100 FX, both in 100 grain.