The only + to a track crankset is that the c-ring shoulders on the crank spider are matched for a 1/8" chainrings. The only advantage I can see of 1/8" rings for your particular situation (since you are asking about road cranks I am assuming you are not running on a track) is that they tend to have a wider selection of tooth counts than 3/32" road rings. I can not for the life of me find a 47t 3/32" ring in a 135 BCD (Campy), but can easily find a 130bcd 1/8" 47t track ring. Same goes for a 49t ring....