Higuain is more like a poaching/finesse striker while Benzema is a clinical finisher. Both are great, I would say play them 50-50 depending on the lineup. I would put Benzema with Ozil and Higuain tagging with KAKA
The best thing would be the way Morinho is handling the situation curently, giving both Benz and Heguain 50/50 starting. Let him do his job. Non of you qualify to say who starts and who is not. Morinho is amazing at how he motivates his players. By giving one players more preference would damage the other players' confidence. In professional Futball, its all about your confidence, not much of Futbal skills