I say Petrovic. From what I've seen and what I remember as just a pure skilled player, he was a lights out shooter.
Larry Legend though is a close second. He really took the art of shooting to another level and you knew if you left him open you were gonna pay. Hell, how many times would he call his shot and know that he was going to hit it?
Reggie was simply clutch and hell, New York City still has terrible memories of him.