Some of us that race on a concrete surface can only use rubber tires, if you use foams on a concrete surface....it would wear down before you completed 5 minutes running nitro. Most of the large organized races are on asphalt where we do race foams. So I think that it is the surface preparation that drives choices of foams vs rubbers. Some of us even race rubber on old asphalt surfaces around town. There should be no argument in this thread.