I have 2 favorite live discs:
Judas Priest - Unleashed in the East
Kiss - Lost Alive II (Bootleg)
(Not an actual release, but their series of shows during their first visit to Japan were recorded for
Alive II, but the performances were deemed insufficient for release.
I don't know what they were thinking, though as the performances have all kinds of energy. Anyway, the sound is close enough to
Alive II that many people think that they actually did use some of these performances for that album. It sure sounds that way with the audience.)