Favourite? The Yes Album. I remember hearing it for the first time when I was 14 as a budding bass player, sitting there with my Eros EB copy and listening to Chris Squire and wondering how the hell he did it. That perfect time when they were really breaking free from their constraints and starting to realise their potential, still full of youthful abandon but before they realised their genius. The joy of this album is palpable. And Chris Squire's bass playing is just wonderful - that little run up to the high registers on Starship Trooper is still my favourite Squire moment. The production is still quite raw and basic but this allows each instrument to shine, but there is still a lot of space for everything to breathe, something they had forgotten about when they got to Tormato
As for their best, it has to be Close To The Edge. The very pinnacle of the genre, unsurpassable.