Both are sound proven designs. Both, when raced, will perform to their respective ratings so do you REALLY care if one is one-twentyfifth of a knot faster in absolute terms? When you race either of these boats, your results will be 99% your sailing skill and 1% your boat's factory design.
In older boats like these, your own description says it all... one is in great shape with better sails and outboard; the other good shape with older sails and outboard. Better sails and outboard alone make up the $500 difference three times over.