Weight to power ratio and suspension and gearing and tires and traction all play a huge part in how each one will launch and accelerate... You could have all the power in the world with either of them but if your heavy or have shitty suspension and gearing set up or bad tires for what your doing your not going to do jack shit. You could have 20 more hp and still not win if your not set up properly for your hp. Rider size also makes a lot of difference. Fact, fat ppl go slower