If you plan to race mx a lot and can part with $8k+, the yuki is a great choice. If you plan on racing mx some, but not always, the YFZ is a good choice. My racing days are gone, and I spend a lot of time in the desert and dunes, so the Honda makes more sense for me. 8 out of the top 10 ATV finishers in the 2005 Baja 1000 were Honda 450R's...

 

You need to include more info like SFA said. I can't recommend anything without knowing what you plan on doing with it.

 

Wow...Come in with a question that can't be answered with some more information........call people names.....confuse an ATC110 with an ATC125......ask if a guy wants your number....say you're 15 years old...and then sit there at your keyboard and wonder why you can't get a straight answer to a crooked question.....
Really, if you want some help have you really need to be a little more specific.
How much money do you have/want to spend? What are your plans for the quad? Trail riding? Racing? Dunes? A little of all of the above?
A little bit of positive attitude goes a long way, at least where I'm from in Ohio. Try not to confuse somebody asking questions to give you a better answer with somebody showing disrespect, which is something you might want to consider before you reply again. If you want help, be specific, and it doesn't hurt to ask nicely. Just my 2 cents worth.