@sickVisionz: Fair enough, cheers for your view. I agree with pretty much most of it, except I must have been one of the only people who loved SG from start to finish. I actually would have happily watched 24 episodes of the kind of stuff at the beginning, I just really liked the humour and character interactions I guess.
@phantomrant: I definitely agree with a lot of that, cheers for the opinion. And yeah, FZ might just have the best soundtrack I've ever heard in an anime. Although, I'd have to say that SG's story was, for me, fantastic. I think it had the best ending of the bunch, and it just generally kept me hooked and interested throughout. Even in the earlier episodes, I was constantly interested in where it was heading (I felt there was loads of build-up).
@Dream: Those are all fair points, thanks for sharing all that. One of the only things I'd differ with you on is the story department. I felt that SG kept me guessing far more than FZ did, it became quickly clear that the winner of the grail war was going to be one of the three kings. As engaging and brilliant as it was, it never felt (to me) as intricately woven as something like SG.
For me personally:
Animation- definitely Fate/Zero. That and SAO are the best looking anime I've ever seen.
Music- Fate/Zero, followed closely by FMAB. There are so many good tracks in both.
Characters- I really can't decide on this, but I think it would be between Death Note and FMAB.
Premise- Death Note and Fate/Zero, as you said, Dream, though I think I'd give DN the edge (the whole idea of it is just so interesting).
Story- Stein's Gate, followed closely by FMAB. Was interesting, kept me guessing and had the most satisfying ending I've ever seen in an anime. DN would come close if it weren't for the later episodes, which felt almost sloppy compared to the first 20 or so.
I don't think I'll ever be able to decide on which of these is the best; together they're probably the best 5 anime I've ever seen. Was just interested to hear everyone else's views.