From a classical physique standpoint, I'd have to say Samir.
But I much prefer prime Ray's build. He always appeared like one strong and powerful "little" dude. And he was.
Shawn was a very impressive squatter and presser. Great weight trainer. Made guys like Branch look like retarded know-nothings with spastic inclinations.
Ray was methodical, precise and technical. Like a machine. His squatting was beautiful.