I have a soprano Flea which, while not technically a pineapple, is similar. I also have a traditional concert--Lanikai. The soprano has a brighter, louder, and more sustained sound than the concert. I'm not saying this is always the case; it depends on material, strings, etc. But that's my experience, plus I like the pineapple-ish shape.
Just me and my
Fleacia Podcast
Can't beat the Flea for the amusement factor...