Voted King Crimson, because I know their works much better than the other groups and the day my Dad gave me In the Court of the Crimson King on vinyl, I was forever changed.
I love Genesis, especially Selling England By the Pound, but I find Yes more satisfying overall. Fragile, Close to the Edge and Relayer (and Drama, too, but I doubt I’ll get much agreement) are all just perfect.
Even The Ladder is a great album, and that’s from 1999!
King Crimson I respect more than I like. I love Discipline, but a lot of their other stuff is hard work to enjoy.
For interest’s sake, if you look at the Prog Archives Top 100, you have the following notable artists/bands:
Genesis: 5 albums in the Top 100
Yes: 4
Pink Floyd: 4
Van Der Graaf Generator: 4
Rush: 4
Gentle Giant: 4
King Crimson: 3
Banco Del Mutuo Soccorso: 3
Camel: 3
Frank Zappa: 3
I went with Yes, since the obvious choice – Soft Machine – isn’t listed. Gentle Giant and Mike Oldfield also are as good if not better than any of the groups mentioned.
And calling Rush “progressive rock” is like calling Led Zeppelin polka music. At their closest, they’re third-rate Styx.
Gotta go with Crimso. I love Floyd, Yes, ELP and the rest, but seeing Fripp and Co. on their Larks Tongues and Discipline tours made me a convert for life.