I'm another one voting for manga. Every single one of my favorite, most adored scenes in the manga were completely omitted from the anime. The characters look strange, move strangely, and lack everything that makes their manga selves endearing. When the anime came out a while ago I was really excited about it, and downloaded the first 3 episodes.
...I only made it through one and a half before getting bored, and I'm a very patient person.
Now, I understand why they've dumbed everything down, but I can't understand the complete lack of quality and characterization in the anime. Even with severe limitations for blood and drinking, I'm sure this could have been handled better. u_u
It's a little difficult for me to word how much more emotion is being expressed through the manga, but (I won't get into spoilers, so don't worry) when chapter 120 hit, I can't believe how much my heart sank at the last page. I was actually very much into a different series at the time and almost forgetting a little about TRC, sadly, but after that chapter I had trouble sleeping that night. I talked about it for the next two weeks. I have seen more episodes of the anime, and it has never had that impact, and never could with the style it has fallen into.
Ahhh, I've talked so much. u_u (Also what I have said has been mentioned in everyone's posts already, so probably this is pointless...)