Had to reply 'neither', not because I dislike them, but I can't say that I prefer one over the other.
I do listen to more jazz than classical, but that's because the pieces are shorter, and also, to appreciate classical requires more concentration. Apply 'usually' to both statements.
I still listen to lots of Blues, and one could argue that Jazz grew out of that. Contemporary Jazz also takes quite a bit from World Music which I also like.
In general, I like music with some complexity, which is why I don't like Country, most Pop, and have more or less lost interest in Rock or Rock and Roll. Well actually, nobody's really doing those last two anymore, except some niche material like Metal. It's all Pop.