It's a tie, because I can hardly tell, between Jack, Jack, Jack, Andrew, and Jack.
The first three Jacks are from Fallout 1, 2, and 3.
Andrew is likewise from Ner Vegas, but he isn't part of the Jack line because Lone Wander Jack would still be alive in his time.
Finally, the last Jack is the boss of the Third Street Saints in SR3...who shot, ran over, stabbed, bludgeoned, burned, blew up, crashed on top of, and whatever else ANY PERSON HE COULD FIND in excess.
But I can't tell who's better because my Fallout characters do this as a matter of necessity to survive in the wasteland.