"community property" is not usually a term that applies in income taxes, unless you are selling the property and realizing income from that.
Filing "jointly" has nothing to do with whether you are living together, it only has to do with which form and which tax rules you want to use. You should do what will give you the lowest overall tax rate. The way to know which is better for you is to complete a joint return in TurboTax, then create two individual returns, and see which way gives you the lowest overall tax.