I found the 1997 concert in YouTube, that was my first of the 3 I've seen.
If I have to pick a song or moment that was THE best or unforgettable moment for me, it would be when Christine finished Songbird. She usually thanked the city and this time the way she said "New York, New York, God bless" was so emotional. I was a bit far but I would swear she cried, like when John told the crying story in the Making of Rumours video.
https://youtu.be/O3cddSRkbXY?t=8069
At the second concert, Dallas april 2009, the best moment I choose is Storms. I never thought I'd see Stevie singing Storms live, and that I'd be there.
And the third and last one, NJ oct. 2014, of course the return of Christine was THE best of the show, but if I pick a specific song, it's Everywhere. Though I felt the sound was not so good at the Prudential Center, it was beautiful to see Christine singing with the band, and the whole band enjoying a lot.
https://www.youtube.com/watch?v=uOVkBAnsZ-Y
Do you have favorite moments of the shows you have seen?