That's a tough one, but I guess the first album with Rick Wakeman -
Fragile. If you don't like that, then probably no need to go any further. Although
Drama with Trevor Horn is a very different sound, a bit more rock than prog, but they only did that one before the original band broke up. My knowledge ends there as I never bothered with them after that.
Roundabout
Long Distance Runaround
Heart of the Sunrise
3 best tracks IMO
https://static.qobuz.com/images/cove...975822_600.jpg
I used to love the sound of Chris Squire's Rickenbacker - he played the bass rather than just keep time.