I like the MTZ look more than the Boss, but was going to get the Boss because of the positive reviews.
Big Brand Tire told me today that they couldn't get me the Boss tire. Discount tire can get me five Boss tires from the east coast, but warned me that they've been discontinued by MT. WTF is that all about? I didn't expect that since the Boss is supposed to be a newer offering.
I'm leaning towards the MTZ since they look similar to my STT Pros that I like. The STT Pros are on backorder for Discount tire until May.