There are no imaginary points for filing first. If anything, you lose points, if you actually care about the marriage. It will come back and bite you if you file first.
File for divorce, only if you Want Her Out Of Your Life. It's not something that you should play games and strategy over.
That's my opinion, but i'm sure there are plenty others
Here's my take on it.
Only file if you can't live like you are.
The time to file is: "It doesn't matter if I'm married or not; I'm not living like this any more." That way, you win either way.
When you have detached and are ready to move on, file. File for you. It doesn't matter about her. If it's important to *you*, file. Otherwise, GAL.