Recency bias: Tool - I hadn't been to a concert of that caliber in years, it was exactly what I was craving. Setlist was incredible and the band were on top of their game. 9.5/10 wish they''d played vicarious instead of the pot.
Favorite band: Rush - saw them back in 2012 on the Clockwork Angels tour. There's no way these guys tour if they can't play, show was great despite a lackluster setlist. I'm a 70s/early 80s rush fan and that era of their discography was largely unplayed.
Childhood: System of a Down - I was a massive fan of these guys and a young teenager and my old man took my brother and I to see them in '05
Honorable mentions: Black Sabbath, Slayer, Rob Zombie
Reminds me of Theseus with extreme measures in Hades