I don't think there was one. I can't name one. Not because I had a lot of great feuds, but it would be hard to say the defining feud.
To be that man, you've got to beat the man. Woooo!
To be the man, you gotta beat the man!
I had my first 'Survivor Series' in 1991 and I was fortunate enough to be an instrumental part of the shows I was on.
To be a man you've gotta beat the man.
I enjoyed my time as Raw Co-Owner. Actually I got beat more! I got beat up a lot as Co-owner but it was ok.