motox has the ticket, get both and you can use each for waht you want to do. I love my raptor for desert racing and horse'n around and just about everything else. But when I need some hold on for dear life speed I bust out the beast (84 Yamaha TT600) and crack the throttle wide open. Or if there is a hill that has been kicking my tail on the rappy I will take the beast out and rip it a new one a few times so I feel better, and find the best line for the rappy to take. IMHO bikes are eaiser to ride and a less likely to hurt you when you crash, which is a common occurence due to balance at slow speeds and in sand. Quads are harder to control at high speeds and when you do get out of control they take you for a ride if your lucky and mees you up if your not. Any body I ride with will be happy to jump on my rappy and take it for a spin but if I'm on the beast I cant talk anyone into riding it, evan other bike riders. It's all preception like stated elsewhere in here, quads look easy to ride and feel slower due to their weight but in general top speed is fairly close to bikes but with 400Lbs at 60-80 MPH momentum is not your friend and wont help you make that hard turn or slow down over those braking bumps. All that extra weight to controll will wear you out faster when riding hard, but if you are in tight trails and deep sand or alot of slow speed no run trails a bike will wear you out faster than a quad since you have no resting period like a quad will allow you to do on 4 wheels. You can go and do almost anything on a quad that you can on a bike unless physical size is a factor like fit between to close space trees. So get both and have fun.