I've sailed both, the 5.0 felt faster, maybe it's lighter. If he's not going to race it, he should get which ever one is in better shape, sails, rig, etc. Both are good boats for play. Neither one will pitch you quite like a Hobie 16 can! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />