In summary, graded such as well maintain of lower graids are good for ridged, but a articulating one can go over most turain, steaper graids and can take tighter turns 3:40 3 different tyer types Then more on how articulating an go over tight coners, Ridged ones can carry more and go longer as they can sustain more weight and take more punishment as they have less movinvlg parts and are cheaper in cost and mantance