To be honest, as much as I am a huge Bjork fan, I am much more so a Sugarcubes fan. I suppose it's because they're more exciting and YOUTHFUL or whatnot, but I tend to listen to them more than Bjork's solo things nowadays, and usually her regular songs I tend to go for are from Debut which is more Sugarcubes-like than her future albums. This doesn't mean I don't like her any more, it just means I really, really like The Sugarcubes. Motorcrash, Planet, Hit, Water, Birthday, Eat the Menu...they're just all really enjoyable songs! That being said, there's very little of Bjork's work that I don't like, but it definitely exists. I wasn't a big fan of Volta at all, though Earth Intruders was really dang good. Also I get what climbtree is saying about Medulla, but it took quite a while to grow on me. Triumph of a Heart is the best of the album I think, though.
In conclusion: The Sugarcubes A+++ Bjork A++