When you say 125cc I assume you're looking at MX two strokes Actually there is not much difference in height between a 125 and a 250 altho a huge difference in performance, The 125cc in any brand is very peaky with a light switch power band and must be kept on the pipe in order to run correctly. This equates to constant use of the 6 speed tranny. Not the ideal trail bike, especially for a novice rider. Much depends on what your riding style will be as to 2 or 4 strokes
Gotta sit on em to find out what feels best.....a test ride would be even better.
Are you a beginner? If so, take the MSF course 1st. Learning to ride properly on their bike will help you a lot in making your own decision.
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