I've shot a bunch of different broadheads over the years... 2, 3, and 4 blades... I'm sticking with the Magnus 1 2-blade and the Zwickey Delta 4-blade. Easy to sharpen, hold an edge well, durable, and put critters on the ground when I do my part.
As many have said, there are a bunch of broadheads out there, some more expensive then others... But, if you get yourself pretty much anyone of the "Name Brand" cut on contact fixed blades out there (be it a 2, 3, or 4 blade), make sure that it's sharp and spins true on your arrow it will do the job for you.
The rest is just semantics IMO...