If you are going racing, get the R1. If you want to ride on the street get the FZR. It's at least 50 pounds heavier, but more comfortable. It's probably 1/3 the price, and has a better fairing than the R1. The engines are basically the same, but the R1 is tuned for high RPM horsepower. The suspension is better on the R1, but if you have the skill or the money, you can make the FZR almost as good.