300 ex unless its a really built up trailblazer and even then prob the 300ex...

 

I don't know about that dosen't take that to big a mod to beat a 300ex I have raced them for the last 7 years off an on an with me TB in all stage of modding up.

 

If buying used go with the Trailblazer for what the price differance is you can have a killer 250.Our old 2001 Trailblazer would run with if not beat a piped 300ex and 350 warrior.(I know this for a fact because I sold the 250 to a buddy and he can beat my son on his piped 350 Warrior and my son even admits that his old 250 is faster than his warrior)All you eed is a HPD pipe ,clutch kit,port joband a carb that is jetted correctly.

 

i agree that the trailblazer is a great quad BUT raceing aside the 300 is a great quad to ride
it handels great and can wheelie. if your going to race it then get the TB if your just riding around get the 300. the weight is also factor here the 300 is really light and easy to throw around..