I went a really long time assuming Starless & Bible Black was some kind of live bootleg or something. Like, for years it didn't even exist in my mind, I was aware of all their other albums even if I hadn't heard them, but that album just seemed to pop into existence from nothing. Still need to listen to it.
Red or Discipline would probably be my two favorites, but I like most of their stuff a lot. I don't get the weird backlash I see against Islands over it having a couple of songs about women or whatever, musically that's one of my preferred albums as well.
One potentially actually controversial opinion: I can barely distinguish any of the singers on their pre-Belew material and couldn't care less. Before I even read into the various line-ups I assumed it was the same dude on all of those albums tbh, so I think it's really funny when people say Lizard is ruined because the vocalist apparently has too much influence from his earlier folk rock days or whateverthefuck people complain about.