Normally, you will pay less tax on your federal return if you file married-joint but you would have to do it both ways to see which is best.
Arizona is a community property state, so if you filed a separate return your spouse would get taxed on half of your income for the most part. You would have to account for community property income and deductions. However, if you filed jointly your income would be higher. At the same time, you would get credit on your Virginia return for taxes paid to Arizona.
Since you are the only one that has income, it may be better to file married-joint in Virginia, as you will get more deductions that way.
So, it will probably be best to file joint on your federal and Virginia returns. For Arizona, you will have to do it both ways to see which is best, unless you don't want to fool with the community property income allocations.
Also, to file separate on the state returns, you have to complete a separate federal return that you don't file, but it is the only way to prepare a separate state return.
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