As for right now MA still has the the upper hand easily. CFS has only one real benifit going for them and that is the drivers that they have under contract that MA doesn't. MA's quality control is getting worse and worse and if CFS will get a handle on there quality control and marketing then it is possible in the future that CFS could become a major player in the diecast collecting scene soon!!
If you are familier w/Team Caliber Preferred Series cars, then you will know what the CFS cars are like. If you liked them better, you'll like CFS, if you liked Action cars better, you'll like MA.
See my post about the CFS Toyota Camry and you'll see pics I posted of my CFS Toyota "Cat" Camry.