To many 70's kids like me, Close to the Edge is the quintessential Yes album. In fact, I'd say it's one of the greatest pieces of recorded music, ever. Still blows my mind how young they were when they made that. Next would be The Yes Album, Fragile, Relayer, Tales, Going for the One---in that order IMHO.
I mostly lost interest in the 80's Yes and ignored the 90's Yes. I'm too much of a 70's Yes diehard - the later stuff just doesn't do it for me--some of it I find cringey - though I certainly appreciate that they kept trying new things, and trying to stay relevant which is a very hard thing to do over that long a career.