Just like with rifles, "energy" favors velocity, and doesn't necessarily translate directly to killing power. Razor-sharp cut-on-contact heads are catching on because they penetrate and kill well even from lighter, slower bows. It seems reasonable to me that a three-blade would take more force to penetrate than a two-blade, but other factors may come into play, like shot-placement. Obviously, a two-blade is easier to get really, really sharp, which is the most important thing IMO.
Watching this series on YouTube may give you some good info:
https://youtu.be/mJJqertQbHUDon't recall them selling anything, except an idea maybe. Good pig killing, too.
