use jackpot for the mission that don't have version bonus reward like they only listed 1st,2nd ,3rd and so on (not ,if more red cat, 1st x ,2nd x etc. if more white dog 1st x,2nd x) usually prize for those mission only the 1st reward is worthy enough or sometime unique.
jackpot aura is from white dog insignia book , while friend finder is from red cat book , this cheat allows you to use them without the need to buying them from the book and game version. which is the best reward is up to you , you could be aiming for that 1st prize , or you could be aiming for the special prize or even the 2nd one to get certain material.