Generally, filing jointly will give you a bigger refund or less taxes due. When you file separately, your tax rate is higher and you won't be able to claim:
On top of that, if you live in the community property states of Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, or Wisconsin, you have to deal with community property allocations and adjustments, which adds extra work and complexity to your tax preparation chores.
Your best option is to file as Married Filing Jointly and include with your joint tax return a Form 8379, Injured Spouse Allocation so that your portion of the tax refund will not be seized for your spouse's debts.
See this TurboTax support FAQ for the Form 8379 - https://ttlc.intuit.com/community/accessing/help/how-do-i-file-form-8379-injured-spouse-allocation/0...
