i prefer spalls,seems more palio to knapp that way
however,like VB i live in an area with little to no knapible material that is worth adamn
so slabs are easier to aquire at rock shops,less waste of material and $$$$
i dont think its easier to be good at knapping slabs over spalls,both require differant skills
it does seem easier to squeeze and break a slab than a spall,but that just teaches good hand control