I had a tough time choosing Gehrig over Ruth and Clemente over Mantle. but the deciding factors for me was there is far fewer collectible items of Lou then Babe. And the Mantle/Clemente ratio is night & day.
I do enjoy the challenge...who doesn't.
Here's an example. Just how many game action "batting" photos do you see of Gehrig and Clemente compared to Ruth and Mantle.
A pair of vintage original TYPE I photos:
1927gehrigbatting.jpgclementeEMMONS1.jpg