aren't "grip" and "wear" in inverse proportion to one another? my conti 4-seasons are super grippy; but i'm lucky to get 3000miles out of one before i run the center off. on the other hand, my schwalbe marathon plus are less grippy, but still pretty good, and wear forever; they also weigh about 4x as much as the contis (or maybe more). in a tight choice, choose "grip"; "wear" isn't as important if you don't have reliable grip.