Which motor?

Hello to all! I am new to this site and the 1/8 brushless scene, I am about to place an order for a brushless system for my ofna buggy. I'm going to get the Warrior 9920 esc.........but I was hoping that some of you who have done this before might to be able to help me to decide weather I should get the Feigao 8L or 10L motor. Any recomendations will be greatly apriciated.----Jacob