This is a tough one! I have heard Parsifal, Ceramique, KR8000 -- but NOT together! The little I can contribute (pls excuse the haphazard vocabulary...)
*Parsifals with Lamm electronics (tube): The sound was "elegant", the piano particularly natural, spaceous & palpable (Brahms 1st concerto/ Curzon, as I remember). If the music were converted to clours, these would be soothing and dramatic at points. Microdynamics exceeded macrodynamics -- the latter impressed me anyway (this, from Mahler 5/Barbirolli). String instruments were beautiful.
*Ceramiques (don't remember if it was the big woofer version or not) with the s-tweeter: very liquid sound, completely seamless, the "colours" as above, would be much brighter here (I don't mean fatiguing in any way) and, thereby, more evidently contrasted. The sense of space was exquisite (the s-tweeter?). The sound, subjectively, may not have been as "delicate" as with the Parsifals... so, rock/blues MAY sound slightly better with the Ceramique, but I'm really splitting hairs here.
(I have completely revised my initial views on the Ceramique; I had thought the sound unimpressive, I was wrong.)
Overall, maybe a difference is that the music will present itself in a more dynamic manner with the Ceramique than the Parsifal. This said both are very capable of playing Wagner for you, so it's a matter of which does what EVEN better.
My 0,2 euro (hopefully not a total waste of server space!) Good luck!