|Like Biff writes, plate length is a personal decision. But I think there are criteria. Like you write, a shorter wheel base provides better manoeverability but less stability. I ince had a set of shorter plates on my street skates and I didn't like it. It's probably bećause I like speed. You get quite fast in a big ramp and then more stability matters. You also get quite fast when riding downhill and then stability matters, again.