I'd be happy with either, but I chose low grade common with tough back. Low grade meaning VG'ish.......not tore up "poor".....
I can only speak for myself but it's not just "the back", it's the combination of the player on the front along with the tobacco add on the back together- some combinations are scarce, even if the tobacco add on the back isn't one of the toughest backs (like this Bresnahan portrait with EPDG back):
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