You get more PFAS in the hard shell.https://toxicfreefuture.org/press-room/mcdonalds-announces-global-ban-of-toxic-chemicals-in-food-packaging/
They were still styrofoam (expanded polystyrene) and it damaged the ozone layer when you crunched them up. As god intended. /s
Hard shell, it soaks up the Coke much better, when you dip it in.