Planes can glide in case of engine failures, something FAR easier than a successful autorotation... Of course they still need a place to glide to the ground, gliding capacity of a typical plane it's not those of a glider, but even if a chopper successfully autorotate finding a reachable place it's not simpler, the range around is far, far shorter than a high altitude gliding airplane.
Also wings are fixed passive stuff in 99% of plain, of course thy can crack, but far less likely than a rotor mechanical failure...