In the end she became a stronger person by learning everything Dauntless needs to know/learn. She's a fighter, emotionally and physically!

Obviously. She wasn't happy with her life in Abnegation. She wasn't cut for that kind of life.
Also, Dauntless made her a stronger person and taught her some valuable lessons.

^I agree with both of you. It's like she practically said, her picking Dauntless was brave and I think that decision alone was enough to tell her she'd chosen right.

She got stronger (abnegation was obviously not for her) plus she met Tobias(SO MANY FEELS)

I'd like to hear what the person who said 'no' has to say...

yes n the more she stayed there the more it seemed dat she belonged there

yes...
mainly because of Tobias ^^ My feels~~ <333 (again)

You can't say she made the wrong decision, it was her choice, I wouldn't care if she chose Erudite or Amity.

Abnegation is the most boring faction. I'm glad she got out of there.

UMM DUH or there wouldn't be a movie or book because it would be boring.

Well if she picked Abnegation she would have died The End and if she picked Erudite, then she would have been evil and her picking Dauntless is kind of the kickoff for the entire series, from meeting Tobias to learning how to shoot a gun and all that.