witch cannondale or atk is the fastest of them

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Polaris 6x6(dads work horse/pulls anything)
Quadrunner 250

As far as stock the moto and the blaze had the FMF full exhaust which gave them 40hp stock . . The others had a usfs approved exhausts which limited them to around 37hp. All the engines were a 432cc. Those might seem low but when they came out there was no such thing as a 450 class and it wasnt until 06 that the other brand quads were into the 40's stock.
If your talking modded Id say its pretty close between Happyboys 495 and my 470 .Both exceeded 70hp on the juice.

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Witech-450mx
Witech-450trail
Witech -470 drag ,dune