Yes, the significant tax benefit to filing jointly is that you will qualify for the Advanced Premium Tax Credit.
If you file separately, you will not qualify for the Premium Tax Credit and if one of you itemizes your deductions, both of you will have to even if it's not beneficial for one of you to do so.
It is almost always better to file jointly.
Here is a great article explaining the advantages of filing jointly and the consequences of filing separately. Filing Jointly vs Separately
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