Kuroshitsuji!

[Dance of Macabre]

Manga...
You learn more about the Shinigamis
You meet the newest worker of the Phantomhive manor, Snake. (He's my sexy reptilian)
You actually will like Lizzy in the manga.
You get to know more about Ronald Knox.
The Noah Circus arc was really good.
Though the anime was not that bad. I thought Daisuke Ono's voice for Sebastian was freaking sexy. All the voices were nicely chosen for the anime which I really enjoyed. Even though Kuroshitsuji 2 was pointless it was interesting. You got to love the perverted demon with a shotacon, Claude. XD The ultra sadistic cutie Alois. Sexy demon maid Hanna. Etc etc.
But for plot I prefer the manga.

Look at him!!!! (Snake)

[arcticpuppets]

the manga is SSSSSSOOOOOO MUCH BETTER!!!! Noah Ark Circus all the way!! whee

[xLadyShinigamix]

The manga!! The anime left me in the dark!! >:[

[Manga Grl 01]

the manga is waaay better... 3nodding

[Meiran_666]

As many other Gaians have already said, the manga is waaaaaaaaaaay better

The anime's ending is not that bad in my opinion, what I dislike about the anime is that they tried to add more comical scenes, fan service and whatnot that just don't fit, I liked the darker tone that the manga has, but I guess is up to you to decide which one you like better.

BUT SERIOUSLY, READ THE MANGA!!!! XD

[O-Ms Kitteh-O]

I'd say read the manga, but I liked the anime as well. Granted I enjoy Alois and he has yet (and I doubt will) make an appearance in the manga.

Though I'd say out of all of it, I like the musicals the best. sweatdrop

[Perilous Pixie]

UseiChi

Manga!!!!!! heart

Agreed! smile

[EbonyDemon]

Ive seen both seasons and the secong one rlly surprized me!!! especially the end!!! it was freakin awesome!!! i recomend it if u cried at the end of the first one!!! i was like "OMFG!!!"