I grew up in NYC, 50s and 60s, and watched Aparicio play against the Yanks all the time. Smoooooooooooooth.
I think Omar's next ...
Best SS ever at turning the double play (as opposed to starting it).
Omar's ability to stop his forward momentum and jump straight up from behind the bag to clear the sliding runner, then launch a strong throw at the peak of his jump was amazing. Nobody ever did it thatta way.
Best current day SS at turning the double play: Jack (No Hands) Wilson.