I can see advantages and disadvantages of all the 450s. The YFZ is a ready to go track ready race bike. It rides harsh in the dunes, but makes up for that with plenty of power. The Honda 450 seems opposite of that to me. Great ride, not near the power of the YFZ. The LTR and KFX are track ready, but I would say a little more user friendly when it comes to tuning. It takes a matter of seconds to re-map the EFI vs. a little patience changing jets. The drawback of the LTR for me is the IRS, im not a huge fan of that on a sport quad. As for the KFX ive yet to see one run, just heard so only time will tell if it is worth a crap. I think they are all good bikes, they are all just aimed at different crowds and there should be 1 that would work for you out of the four.