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Dakrai, it's a huge scary beat of nightmares! I never really liked Cresselia's design though, it seems somewhat silly :( Whereas Darkrai's design is 100% epic and it just looks like a complete monster of a Pokémon, so it definitely gets my vote.
In these questions I always go by design because I have no knowledge of what's better than what in battle and why (retro gamer, not into the whole metagame), so I'd go for Cresselia seeing as it's by far the prettier of the two. I also like Psychic more than Dark as a type, generally :P