GTA IV who 2 kill?

In the mission Blood Brother who do i kill. Derrick or Francis. Plz list the pros and cons of each and which is the best way to go. Plus list the bonuses you get for killing each.

Thanks in advance

derrick doesnt get u much but hes alot cooler

francis is a complete a$$hole but he gives u a number that u can call and get rid of ur wanted level