all my stuff is stihl. never had a problem with them yet. and plus that is all my dealer carries, so that is what i run. Good pieces of equipment. They are expensive though...
My set up:
-2007 Chevy 2500hd 8.1l 4x4
-7x18 enclosed trailer
-Grasshopper front mount 61", gravely 52"
-36" Gravely Walkbehind, 21" exmark push mower