I think Locky helped make Smith (and all the QLD greats really) the leader he is today, but Smith perfected the art. The guy has gotten his side into the GF playing a hybrid hooker/ halfback role, is able to make the refs bow to him like a siren to a sailor, acts as an on field coach to the point where Bellamy has like a sub 30% win rate without him, and is bullet proof in that he does what he wants in the ruck.
That said, if you offered me either one at 18 years old knowing how their careers would pan out I would be stuck on who to pick.