When they're well made, I don't think there's much of a difference. Our ICOS system are all dipolar transistors (and without capacitors) -- and we try to make sure they don't have their own sound, as opposed to many tube machines (but not the best ones, that can be exemplary transparent).
This leads to a question I've wanted to ask: how many classical music lovers are there among "audiophiles" around here? In France, your typical hi-fi shop is usually at least well educated in classical music and has classical music CDs. But here in Denmark, I've been meeting dealers and users for a couple of months now, and not one even had classical CDs.
It's not just a question of taste: I have found that people who know classical music and are used to listening to acoustic instruments in concert halls have very different expectations and ways to listen. I find a whole class of audiophiles seem to only know MP3 (or at least electronic) music, find more realistic sound sounds wrong, focus on fundamentals but can't seem to hear the harmonics.