Divergent Book and Movie Fansite
You could base your answers on the book, or your moral values.
I would choose Erudite. they aren't bad on their own, it's just because of Jeanine that they're hell bent on running the government. Jeanine thinks that because she's smart she should run everything. So she brainwashes the Erudite and eventually the Dauntless. But tris saved the day at the end :D. Jeanine sucks, the rest of the Erudite dont. End of story
I think people are forgetting what the book (Divergent) was all about. You can't just belong (or favor) one, without falling apart. you need all of the characteristics to function properly as a whole. No one said it better then Tobias himself. You need to be selfless, brave, smart, honest, AND kind. so asking what faction is best, is destroying the whole concept of Divergent.
I think one of the points of the Divergent topic is that, really, all of the factions are important.
Each faction has their good and bad things, but you're at a best when you at least have 2 of them and like Tobias said first, there is bravery in being selfless. There are times when simply the factions get mixed together in a single action.
Saying that, what I think would be best in general?
Abnegation, without the extremes. But think about it, some of the problems with all the other factions could be somewhat resolved with some selflessness.
What I think is the worst one?
Candor. No doubt. I mean, there's nothing wrong with saying the truth and what you have in mind. But you gotta be more careful about that. The only GREAT thing I find about Candor is the truth serum and only for extreme cases. Also, with that serum... What's really the point of living a life of saying everything in your mind and the truth? Just stick that serum in someone and there you have it lol
What I'm saying is... I find this one faction somewhat a lil bit useless.