I love Discipline, but Discipline lacks a lot of the heavy, evil riffs that can be found on most other KC albums. That's not to say Discipline is not sinister, though. Plenty of moments like that. I think warts and all, Red just wins this one, maybe the debut. I've grown to like the weakest tracks on Red and ITCOTCK, they break up the album nicely IMO, though I wouldn't listen to them on their own. I would even call The Power To Believe better than Discipline, and any other post-70s album. It has everything I love about classic KC and 80s KC, with something more... There's a certain quality to it I can't quite describe, but they were moving in a cool direction at that point.
Beat is the David Byrne meets Robert Fripp album more so than Discipline.