Depends on your sailing preferences! We went on a week with a 450 and a 42 in a group. The 450 tops the 42 for speed on every point of sail. The rig configuration on the 42 (stepped back mast with a smaller main and the self tacking jib which limits the size of the headsail) makes, imho, for a reduced performance from the 450 rig. In a 4 cabin version I dont think you will feel much difference in inside space, but I agree that the flybridge on the 450 is a nice gathering spot underway that the 42 doesnt have.