Randy and Liz, if you look at them across their arc in WWF it's unmatchable.
It was interesting that they started out with Randy as a viscous and sneaky heel with this angelic and classy valet in Elizabeth who the crowd loved. Of course eventually her and Hogan were used to turn Macho face, then when Randy got too popular she was used as the jealous catalyst to Mega Powers break-up and eventually Hogan vs Savage match at WrestleMania V.
Randy and Elizabeth reuniting at WrestleMania VII was one of the all time classic WrestleMania moments, there were people in the audience with tears streaming down their face.
The 2 big angles that followed with Jake Roberts and Ric Flair were two of the best ever, Jake actually striking Elizabeth and having his snake bite Macho was so shocking at the time and you actually believed Randy wanted to kill Jake. The Macho/Flair is still my favourite 45 minutes of wrestling ever from the pre0-match promos, to the match (Still the best ever WWE title match at Mania IMO) to the intense promos that followed, it was everything that is great about pro wrestling.
WCW even managed to use their relationship in a compelling way with Liz turning heel on Macho using their real life divorce as the angle and costing him the WHC, and then she was part of the feud with DDP and Kimberly, one of the hottest angles of 1997 when the business itself was red hot.
They worked as opposites, they worked as a face couple, they worked as enemies with both playing face and heel, and they worked as a heel couple.
They are the greatest and most memorable couple in the history of the business.