MT/R
Why?
-Excellent trail performance- Brand new Km2 and MT/R seemed pretty close, however as my km2's wore I found myself getting held up in the mud way too easily. MT/R will perform with the best of them and sling lots of mud with adequate wheel spin.
-Look Cooler..... my 2 cents
-Better winter performance, easily
-Very livable on the street, wear....ok....not great
Verdict
After owning both I would definitely consider another set of MT/R but would never buy a set of KM2 again