Do you get more money if you kill derrick in grand theft auto 4?

Answer 1

Yes, if Niko decides to kill Derrick, there is a potential reward of $20,000 from Francis (if Niko rings Francis from the roof, just before he is about to shoot, Francis will offer him a reward raise). There is also a small bonus of Francis clearing a wanted stars situation for Niko once, after Niko rings Francis and blackmails him.

If Niko kills Francis, there is no reward or special ability.

There is also a difference in the Undertaker mission for whichever brother's funeral takes place, in that the brothers are buried in different cemeteries.