Well, given that it took place ~50 years ago, the audio and video quality pushes my vote to Hendrix in Maui:
Best concert video ev-ah
My vote goes to Ryman Country Homecoming 1999. Here's one song.
To get how good the guitar solo is look at Roy Clark and Chet staring trying to figure out how did he do that? And yr peers spontaneously cheering.
* 2nd most played song on radio at the time.