Hard to say. The very first concert I ever went to was Seiji Ozawa conducting the San Francisco Symphony in an all-Stravinsky program of:
"LʻHistoire du Soldat"
"The Rite of Spring"
Pretty good, wouldnʻt you say?
I used to spend a lot of time at Keystone Korner in San Francisco where I saw so many very great bands up close. The place only held 200 or so seats. I saw Art Blakey more than once - Stan Getz, Dexter Gordon, Freddie Hubbard, Woody Shaw, Harvie Swartz. I was there for the live recording of the 4 handed piano date of Jackie Byard and Tommy Flannagan. I was there when Art Blakey brought Wynton Marsalis on his first national tour.
You tell me what the best concert was.