Which Bike is better yz450f or kx450f

The YZF is head and shoulders better than any '05 I've ridden: CRF's, KTM's, and YZF's. I can't imagine the KXF being much better. I'd say go with the one with good dealer support and reliability record. Or flip a coin, or go with the one that matches the color of your truck or something.

Sounds like you favor the YZ, but curious about the KX since a good rider uses it. From my own experiences with differenr bikes that family and friends have used, I'm starting to believe its not the bike that's better. It's just the rider. A good rider can ride anything and get the max performance out of it. You're the perfect example of the good rider. No matter what vehicle---you rock on it! Me, I'm lucky to putt on the ATV. :)