Zero advantage to racing wheels but there are decided advantages to having rims that can accommodate 28mm wide tires. The wider tires allow for lower tire pressures as they have more volume and no significant increase in rolling resistance (most of the resistance with bicycling is the air drag from the rider). A 700x23 needs to be at 100 PSI to provide the same load support as a 700x25 at 85 PSI or a 700x28 at 70 PSI. Lower PSI makes for a smoother ride on bad roads and reduced chance for breaking a spoke.