This popped up on my mind today. Of the 4 Warhammer great Chaos gods, Nurgle, Slaanesh, Khorne and Tzeentch, which one would you serve? Here's what each one would offer:
Khorne: ultimate physical prowess and power, unmatched authority and skill at arms.
Tzeentch: limitless knowledge of all things and the ability to bend others to your will.
Nurgle: immortality and practical invulnerability, a life free of disease or sickness, eternal, pleasing comfort.
Slaanesh: a life of limitless pleasure and beauty.
I'd probably go with Tzeentch, since knowledge is power.