Less weight, quickdrive, and not as hard on hi fax or as hard to keep cool. Those were my reasons. Plus it would be cheaper to go 3" than it would to go to quickdrive, if I think I need a 3"
I don't see any issues with cooling. The snow was so hard that you could see daylight under the 3" track. It never even ran warm with scratchers down for two days in 50 degree weather.
I think it was accurately posted earlier that is substantially cheaper to convert the chain case to a belt than it is to fit a 3" track. So
