The anime follows the plot pretty much to the letter, if I'm remembering correctly.
The manga probably has a few extra scenes in it, and just generally speaking is probably mildly better. Emma was pretty well-done in terms of animation and sound though, so it's a close call.
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Reviews of my Work:You are kind of boring - Blackorion
Congratulations! Ur an asshole! - tokyo_homi
Your awesome!!! - Cherelle_Ashley
NightSwan also said that she wanted to peg me, once, but I'm not sure whether to take that as a compliment or a threat...