I have a decent comparison for the two tires... 3 weeks ago my buddy and I who have been deciding which tires to run both picked up new rears for our quads , we both ride 700 Raptors , I went with the Razr 2's he went with Holeshot Hd's. Since we bought them we've been out riding the last two weekends in a row as well as a short ride here and there, were always challenging each and we ride our machines pretty hard, I'd say there's easily 40 hours on each set of tires.
Anyway on Sunday after our ride, we were having a brew and checking out our tires, which we're both impressed with the performance of and both sets hook up awsome, but the holeshots were definately showing a noticeable amount of wear already, a couple side lugs were actually half shredded off, while the Razrs literally still look brand new. I guess a season of riding we'll tell the tale. Just my 2 cents.