New to Mountain biking, I'm 5'8" and about 170 lbs. Looking to ride Greenways with my kids and also be able to go on trails. There are some great trails where I live in Charlotte, NC. I have ridden all 3 bikes that I'm mentioning, but need some help. The 3 bikes are Cannondale Trails SL 3, Speciaized Rockhopper Comp, and Scott Scale 970. Like all 3 bikes and can't seem to be able to make up my mind.