As a Desert Racer out in California, if I had it to do over I would buy the YZ. The weight of the WR is VERY noticable in deep whoops and it feels like it's crashing through rather than skimming. The electric start has proved itself unreliable for consistent firing up, however, I will be the first to admit that my jetting is not as close as it should be. The big issue for me was that the WR has the 5 speed, but after all I have read on the subject, I think you could make the 4 speed work in the Desert. The jury is still out on what the factory Yamaha
boys are running. They are rumored to be on yz's with 5 speed conversions. Counting gears with these boys is not a good indication at the start of a race, you never know if they are starting in 1st or 2nd gear, even if you could hear the shifts with all the other bikes around. To sum it up: The WR is 30 pounds heavier, has really wide ratio gearing, and the electric start is really handy
if you stall in tight stuff or on a hill.The YZ is lighter but you will have to use some clutch if it gets technical or gear it down and sacrifice some top speed (not an option in the Desert). From what I gather, Ty Davis is geared about 14% taller than stock on his YZ and still pulls it off. He, however, is NOT HUMAN! I have been passed by the fast guys during the Desert Scrambles and I am here to tell you- they are VERY VERY FAST. Insane FAST. Good luck in your search, because quite honestly, either bike is a great choice!