I find Scriabin very hard to interpret myself, because he is texturally complex. Unlike his counterpart Rachmaninoff, whose melodies are able to breathe safely above the more salient texture, Scriabin's melodies are interwoven with his texture, making his works very difficult for me.
I have pretty good technical abilities; I've played Rachmaninoff preludes 23/2, 23/5, 23/7, Moment Musicaux 4, Liszt Mazeppa, Campanella, etc, but nothing comes close to Scriabin in my opinion. Right now I'm working on his Sonata-Fantaisie in G sharp minor, Op. 19 and this seems like a huge break from his other more demanding works. Thank God I'm starting with this sonata. I've only done a few etudes of his, namely 8/2, 8/3, and 8/12.
That's just one example from personal experience. But certain composers have other styles I find very difficult. Ravel for instance, has incredible textures, but his rhythms are even harder for me than Scriabin's. In Ondine, for instance, I can never play the climax correctly because I have such a hard time counting those rhythms. It is also very technically hard, and I think the sheer speed and rhythm alone is enough, even if there aren't any awkward jumps, and the length isn't so bad.
~Max~