Unless your earned income exceeds the Married Filing Jointly AGI limit for the Child Tax Credit, it is likely most beneficial to file jointly. Not knowing the rest of your situation, Married Filing Jointly does tend to keep you eligible for the most credits and tax breaks.
DoninGA has provided a good link for comparison purposes.
Please see What is my tax filing status (single, married, etc.)? and What is the Child Tax Credit? for the most detailed information.
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