Best ride will be the 203, although all 3 will have a very good ride and solid feel. I have a 210 and the amount of storage is massive. It also has a bit more front deck area over the 206 due to the beam forward design.

As I understand, the 210 also has a bit more lift than the 206. I've not ridden in a 206, so I can't tell you first hand. According to Jason Bragg, the 206 hull was tweakded some for the 210. The 203 & 206 are both Mountian Home designs, with the 210 being a Genmar boat.