I agree with these answers in a way. Quebec I do consider the best Ween album, they put pretty much solid work into it and combined these sort of different themes, the sound is crisp and clean, the lyrics are cleverly put, everything about it is great. GWS on the other hand, while I never found it appealing I can understand what you mean by creatively. There are elements in there that still spawn in their newer creations like Chocolate and Cheese. However, if I were to pick an album more creative, it'd probably be The Mollusk. It introduces a new twist to Ween entirely. Sea shanties and psychadelia make the album a different experience. The lyrics are crafted in a sort of way where they're made memorable, the instrumentals and the production are crafted as well in the sense of being catchy and interesting to listen to.