them is worse IMHO. Talking to wheel repair facilities and tire shops, they see a fair bit of bent wheels when the wheel had run flats. And it didn't matter manufacturer of vehicle. BMW, Mercedes Benz, Audi, Infiniti, etc. All OEM wheels too which are typically better quality than majority of aftermarket wheels.
I've personally had sidewalls on run flats give out from hitting a mild bump/pothole in the road at low speed (~30mph). Ended up with a bent wheel too.