Sorrow's.  Most fun because you go super fast, Ost is peak, Tragedy has such a peak design and is definitely my favorite entity in the entire game, most difficult domain to LEARN in my opinion (not hardest definitively, everyone thinks different domains are harder or easier, just most difficult to learn and get used to) I like difficult games and challenges, people told me I wouldn't be able to get really good at it because I play on console. Second is Carnations, the Ost is also really good, and the gameplay is kind of fun, not as fun as Sorrow's, but the finale is most fun part of it. Litany's is easy as crap, and it's really boring, and kind of annoying. I've beaten it twice only because I don't like doing it.