BIG difference when you are talking sandrails and quads there, lad. Besides, I don't think any of those are built in China. I think it's Japan? I'm pretty sure Japanese techonology/ engineering is far more advanced than China.
Yamaha, Suzuki, Kawasaki, and Honda have been engineering and building ATVs for many MANY years. Go ahead and buy a China built rail/ UTV/ whatever you wanna call these p.o.s's and see how long it lasts. Thats if it you are still having fun with it after a week.