Paul Stanley says that the best record KISS ever made was KISS Alive. Saying they reached their goal to immerse the listener in the audience.
As for the worst album, he told Classic Rock magazine, there were 2. Unmasked and Music From The Elder.
He said, “Unmasked was tepid and had no balls to it. Actually, the band at that point probably had no balls to it either.”
As for The Elder, He said it was a misguided attempt at impressing people who they "shouldn't have been trying to impress… the critics.”