Willie Mays was my childhood baseball hero. I tried to play the game like him - imitating his basket catch style in the outfield (which made my Little League coach nervous)
I became a Giants fans because of him. I still remember when my father took me to Montreal in 1969 to see the Expos vs the Giants and Mays was playing that night. I was over the moon.
All this to say my choice is Mays.