Well, I just started and have been using super sculpey, but thought about going to the sculpey firm cause I've read on a couple blogs that its a little better for detailing. I've also watched alot of sculptors on youtube and alot of advanced sculptors seem to like to blend various polmeric clays to get the exact characteristics they prefer.
I started years ago and only used sculpey firm and have changed tools over the years.I was using basic sculpting kits at first and now i use knives , basic tools and my hands a lot more.Oh and very thin tipped needled tools