I think it will always be a personal value made by the person interesting in buying it. For me, I'd rather have a card signed by a player issued during their career. Others prefer baseballs or another medium.
A good example of a player who I think is more valuable on a card would be Mickey Mantle. Signed baseballs are available any time you want one really. But the bidding gets pretty spirited when its a signed card from the 1950s.
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