Like for instance, right in the middle of that run of albums they put out The Why Album, which kinda sounds like a less-polished more proggy XTC with more piano. (Thymme Jones's vocals really remind me of Andy Partridge at times). And then 11 years later they put out a stylistic followup called What Sequel which is just as good (maybe better).
This song always pops into my head.
Introducing Lemon is the one I usually give as my favourite cus it's the album that covers the most ground stylistically. Also it's structured really well (2 epics bookending shorter material and everything segues together) making it flow really well. I also really like Fear Draws Misfortune which is closer to "normal" prog and has some of their strongest material.