These two go way back for plot reasons.
Dalon being the first, and DD being an evil clone of Dalon.
They grew to be rivals yet that might change as they are now owned by  boredkomix
Dalon, favored for his ax and loyalty...not to mention lust for some women.
As DD is a similar but more a chaotic childish style in his dirty ways.
THere was a point when Dalon cut off DD's head, but he was brought back due to reasons to be explained later.

Enjoy