I haven't sailed in Adelaide - only Kingston SE and Port Lincoln. I assume you mean in a sharp chop or bigger waves. They have a lot of bouyancy along the keel like all the modern designs. I think both are the later designs. The more expensive boat is tidier having been professionally sanded faired and painted just before Xmas. Any of the modern designs are fast - the nut on the tiller has a far greater influence.............

Cheers
John Dowling
AUS9