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At 5'7" a KX100 is too small for you now, much less in a year or two when you have grown more. Definitely go for the YZ125. As far as a 100 being more user friendly, that is not the case. In small 2 stroke race bikes the less the displacement the more narrow the power band so any 125 will be a little easier to ride than a 100 since it will have a little wider power band. Also the YZ is one of the best 125's on the market.