Yamaha YZ85 LW Or Honda CR85 LW?

Hi I am 13 years old, am 153cm and weight about 55 KG. I ride on weekends on a TTr 125 at a mates place. I want my own bike so i was thinking of a yamaha yz85 big wheel or a honda cr85 big wheel. I don't want a REALLY fast bike just a bike to keep up with my mates KTM SX 85. Help would be appreciated.