I've only used both AVAST and MBAE briefly, and seeing as how MBAE was specially designed to combat exploits, naturally I'm inclined to think that it's a little more ahead of the curve in the anti-exploit department to AVAST. However, again, I haven't seen any extensive tests done on MBAE apart from the tests MBAE themselves carried out, so I'm not obliged to say whether or not MBAE stands tall to AVAST with exploits. My vote is quite simply: I don't know.