Both crawled from the abyss, both killed every demon they found as they moved up and both show a brutal and killing nature. The only real differences is that Maverous takes more of a human form and that Maverous killed simply to prove he was better. Also that Maverous may be at a younger age. Maverous also slaughtered every demon that had a higher military rank. There are several differences but both share one thing.

They are monsters that you should avoid.