Both are simply amazing animes with good story lines and hot main characters, but I would defiantly have to go with Bleach. Its hard to explain why though. Maybe because its not so dark? If it was me six years ago I would had gone with Devil May Cry, but now I got to stick with Bleach. The storyline is much better, longer, and it has such silly parts hear and there. It can brighten your day.
I only saw one episode of Devil May Cry (Same with FullMetal Alchemist :: Brotherhood).
And I gave up watching Bleach, since I missed many of the episodes and the timeline that Adult Swim just annoys the hell out of myself.
[[ Seriously, Devil May Cry all the way. I love it so much; although I'm unsure how I'll think about the 5th game (probably the same as the 4th...) However, Bleach and Devil May Cry do have something in common--- both are action related and verrrry confusing in storyline at times. Thank you, Capcom. XD]]