It's all about the frequency and size of the waves that the hull shapes are designed for. In my opinion, the N20 will hobby horse and slap badly in smaller shorter waves in lighter conditions where the 6.0 will slice right through. The 6.0 is a much better boat in moderate air with choppy water. However, put the N20 in some two footers with breeze and it will sizzle through/over them. In really heavy stuff, it will survive better than the 6.0.