My wife and I have lived separately since last May (more than 6 months of the year). We have two children who spend slightly more time at her home than mine. I make 80% of our combined income and supported her completely during the separation (much much more than half of the cost of her household). We both rent, and do not own any property other than personal belongings.

What is the best filing status for the two of us?

How are our dependents/exemptions allocated?

I am so lost...