Applying for US H4 visa when I have a valid B1 visa

I have valid tourist visa for 10 years. And I am going to get married to my would be who is holding approved h1B visa (stamping yet to be done).

Is it advisable to stay outiside US, get H4 approved and go US

or is it fine if I go US in B1 visa, and apply H4 from there using I-539 form

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