Saw quite a many from the Grateful Dead to Ozzy to all points in between including Elton John!
That said, the best were:
1. Evening with Metallica 1991 - they played for near 4hrs, no opener
2. Ozzy - hard to pick one out of the 20 shows I saw, but seeing the Black Sabbath reunion was pretty intersting being it was all 4 original members on stage!
3. Judas Priest - Painkiller Tour - a harley davidson onstage, women with micro mini skirts on, being 18 years old, what more could you ask for????
4. AC/DC - Razors Edge - huge success, huge tour, awesome show.
5. Grateful Dead 1995 - 14 days before Jerry passes on at RFK.
6. Metallica, Guns & Roses and Faith No More - opening night of tour RFK Stadium
7. First Ozfest featuring Danzig, Ozzy and Rob Zombie - real cool!
I liked nearly every concert I ever saw, all memorable in one way or another! Probably clocked in 20 plus Dead shows, 20 plus Ozzy incarnations, even saw Sha Na Na and Blue Oyster Cult, Rush, Jimmy Buffet, etc.
TD