Well, Good Ol' Jingo is not really a "bad boy", just a Bounty Hunter doing his job. He is actually not too bad of a person, giving out freebies to good people once in a while, like father like son. Well, at least his son prefer to mate with a HUMAN female than some transgender creature.
Maul, is all evil anger. The thing is, while Maul is darn good at the kill, he relies on a more "narrow" selection of skills, being he is going to be a stealthy killer that he is. Jengo on the otherhand, is more resourceful, and is not above doing the less honorable things, like blowing the darn area up with a seismic bomb, if he knows he is in a tough one. And, Jengo is obviously smart enough to know when to retreat.