If I am living with a partner, currently unmarried, who cannot work what would yield the best tax situation in the US: Marrying them and filing as Married - Joint Filing with just the one income to declare? Filing with them as a dependent? Which one would generate the best possible return?

Living with a zero-income partner, what offers the best Tax considerations?

If I am living with a partner, currently unmarried, who cannot work what would yield the best tax situation in the US:

Marrying them and filing as Married – Joint Filing with just the one income to declare?
Filing with them as a dependent?

Which one would generate the best possible return?

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