I never got into the crf vs yzf stuff because I had never ridden a crf. Well yesterday I had my chance. I have a 2000 yz426 and I rode a mates 03 crf450. The only thing I liked about it was the throttle response from the bottom when coming out of a bend. However, the power soon dropped off. My bike has a bigger hit in the mid range and the power pulls for longer. The yzf suspension is a lot better. Believe it or not my front break was better. Considering my bike is a 2000 426 and Honda waited until they got it right before they entered the 4 stroke arena I don't think they did that good of a job. Give me a yzf anyday.