You might be thinking of “And the loser is… Plurality Voting” which describes a 2010 voting systems conference, where Approval Voting ended up winning the approval vote. (I do wish they had had the experts vote under a bunch of different systems, but oh well.)
I think there is a paper somewhere on which voting systems win when voted on under which voting systems by voting experts.
You might be thinking of “And the loser is… Plurality Voting” which describes a 2010 voting systems conference, where Approval Voting ended up winning the approval vote. (I do wish they had had the experts vote under a bunch of different systems, but oh well.)