The first two without question. They were major global pop culture events, especially the first. Even your friend's great grandma knew who the Megapowers and Megabucks were. Not really a good match, but the spectacle of it was unreal.
No one alive then will ever forget when Zeus attacked Hogan at Saturday Night's Main Event leading up to Summerslam. I hated the Zeus angle even back then. He wasn't really a wrestler, it showed, and it got stale awfully quick.
None of the events that followed these two came close to the same stature.
That Sgt. Slaughter worshiping Iraq angle was horrific.
IT shows how people pick things based on different aspects, you picked 2 things based on how big they were at the time, the as you said "spectacle" of it. For people like myself who didn't experience it then, to look back you just see two medicore main events, from a wrestling stand point anyway.