Both tires are older tech, I think the Ultra Sports are the older of the two techs. Might be wrong though as Continental's aren't my tire of choice right now. The two models share the same TPI of 180 in the tire casing which can be an indicator of whether one is faster than the other when all other things are the same. However these aren't the same in all other respects and the Grand Sport Race would be my choice of the two.