I visited the bar that/which my brother owns.
Is 'that' what most would use?
That would be my choice. In American English, it is the only grammatical choice.
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That would be my choice. In American English, it is the only grammatical choice.
I visited the bar that/which my brother owns.
With non-personal heads in integrated (defining) relatives, it's generally a free choice.
"The bar that my brother owns" and "the bar which my brother owns" show no semantic differences, and no syntactic differences other than what follows from "that" not being a pronoun ("the bar to which I often go" is grammatical but "the bar