Unless you have a reason to keep your financial obligations separate from one another, it is almost always more beneficial taxwise for a married couple to file a joint return even if only one spouse has taxable income.
One reason to keep things separate would be if one spouse had previous obligations that may seize the tax refund for payment. However, even that situation can be handled when a joint return is filed.
When you are working on your return, if you use the CD/downloaded version of TurboTax, you will have more freedom to enter your information and make a quick comparison between Married Filing Joint and Married Filing Separate. The online version of TurboTax does not have the same functionality for this quick comparison.
The following TurboTax article will tell you more about the comparison available in the downloaded version:
How can we compare married filing joint with married filing separate?
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