Hallo ;-)

Take your pick really. I wasn't quite sure what part you're looking at making, but Soric is definitely the way to go if you've got a complex shape. The PET core can flex into shapes, but not so easy. It's more flexible rather than drape-able, compared to the Soric which is more like a heavy cloth. To be honest, I was left less than impressed with the thicker PET cores, but I also don't want to conclude that they are as poor as my crude testing found.