No question, I've been arguing this for almost 40 years!! You always see Fisk's famous waving the ball fair,but you never see Carbo's PH 3 run HR to tie it in the bottom of the 8th.
In fact, I personally rate Fisk's HR as the third most important play of that game. Dwight Evans saving catch in deep RF off Joe Morgan in the 11th inning (a catch Sparky Anderson called "the greatest catch I've ever seen"), IMO rates second behind Carbo's HR.
Another (in)famous WS Game 6 was the controversial Cardinals/Royals/Don Denkinger screw job in 1985. So now both the Cardinals (1985, last night) and Red Sox (1975, 1986) have been on both sides of (in)famous game 6 of the World Series..............the Red Sox lost BOTH of their game 7's, and the Cards got blown out (and Joaquin Andujar blew a gasket) in 1985 game 7.