Why not the black to match the lights?

Yes, black would tie in with vanity too . You don’t say what walls will be but if they’re lighter color the dark frames on mirrors will look & show up nicer

Find a picture on pinterest or houzz that you like to help make the decision.

You didn't mention if you were doing chrome or gold in the shower, toilet paper holder, or towel bars. You can get too much gold. might be better to mix metals. I notice most bathrooms with navy vanities and brass hardware have chrome faucets, chrome shower hardware, and chrome towel hardware. knobs instead of pulls can downplay the amount of gold, too.

https://mariakillam.com/is-brass-out-how-to-mix-metals-like-a-pro/

(click to enlarge photos)

Not sure I like your lights with this combination