Well, since I have run both MRT's and champions, I can tell you, I like the Champions better. Dunno, maybe cause they look better.
I have never had a problem with either wheel, but if you do drive it on the street, you would be better off with the champion. I run MRT 36 bolt 15x10 with a 2"bs on my 60 now, and the offset requires a bit more bearing maint......I want to go 17" and bring the wheel in a bit.