Based on individual productions, I would go for:
-- The Producers with Nathan Lane and Matthew Broderick. At one point, I had just taken an m&m when something ridiculous happened...I laughed so hard, I hit the person in front of me in the head with the m&m...and the person felt it.
-- A Funny Thing with Phil Silvers. I think Comedy Tonight lasted 45 seconds, he sang it so fast. Absolutely hilarious.
-- Mame. Not the out and out farce that the others were, but -- with Lansbury, Arthur and Connell in the lead roles -- I don't recall laughing as much as I did, particulArly in Act 2.
-- A Gentleman's Guide. It will be interesting to see how time treats this show. Even though it won the Tony and ran two years, I think it was under appreciated
-- Kinky Boots. Laughed as much the fourth time in a barn in Tampa as from great seats in NYC two weeks after it opened.
Somehow, I have not seen Spelling Bee; I think How to Succeed and Little Me are either overrated or dated; I hated Avenue Q; I felt that Something Rotten relied too much on theatre knowledge... I saw it once with people who were not avid theatre goers, and half the humor went over their heads (although I loved it); and I just don't enjoy the corny humor of Guys and Dolls...kill me.
I would give honorable mention to Hello Dolly, High Spirits, Spamalot (although I have preferred smaller productions to the Broadway version), and Acts 2 and 3 of The Apple Tree.