Bendo has looked amazing his past few fights...but it's hard to bet against Edgar (beat BJ Penn 2x, and KO'ed Maynard). Edgar has the wrestling to keep it standing and will point / run on the feet.
Benson is a massive lightweight, bigger faster and scrappier than Maynard. Less power in the hands than Maynard but he has good wrestling and ridiculous cardio, and can't be choked.
For 5 rounds, that strength and size advantage will pay off.