#7 Steve Austin at WrestleMania XV
Choosing a Best Stone Cold Stunner is like choosing a Best Episode of The Simpsons, but especially when Stunners at WrestleMania are concerned (WrestleMania Stunners are like Simpsons episodes from Seasons 3-8).
Nobody sells the Stone Cold Stunner like The Rock, and he's had numerous opportunities to do so at WWE's Super Bowl; the first Stunner in the above video begins at 1:55, and Rock's backwards-somersault he uses in the main event of WrestleMania XV set the standard for a Stunner sell, and became an iconic image during the Attitude Era.
Other Great Uses
Like we said, literally any Rock sell of the move could make this list, but some others are just as noteworthy. The blocked-superkick-into-a-Stunner sequence at the end of WrestleMania XIV started the Austin era in full, and Scott Hall turned in a magical sell of the move in an ultimately meaningless match at WrestleMania X8.
I'm sure POTUS would argue that his sell of the move was the best, just the best and that picking any other is fake news, though.