If you are going to go by marketing then Becky/Ronda II is probably the biggest match they can do. The Rock I highly doubt will get back in the ring and Cena/Reigns is a match Vince McMahon's ego will want to do at WM at some point.
biggest match by marketing standards
Meekmen in every corner, pal!Why did they ever have Foley and the Big Show as part of the Wrestlemania main event in 2000? Everyone knew it was Rock vs HHH that was the big deal. Big Show and Foley were first eliminated. Half the match was just Rock vs HHH. They should have just had it be Rock vs HHH.