The Beta 300 turns better, has better ground clearance. Build quality is just as good as the Montesa. My son had one with a full arrow exhaust, which made in run real good. The Beta carb is a pain to work on. I had to rejet constantly. We ride from 2500ft to over 10,000 ft, so as a Dad I talked my son into the Montesa. Mainly because my fingers don`t work like they used too. Less labor is better at this point of my life.