Blood, Sweat and Tears or Chicago?
Give me Chicago, because of Terry Kath. (Although note both bands had the same manager).
I saw those guys a few years ago live, still darn impressive.
They have the show arranged so the horn players get a break every so often to grab an oxygen mask off stage, like the football players do on the bench.
I could see them from my seat off to the side.
Two great bands with distinctive, powerful sounds.