Hola,
I’m a native Spanish speaker from Spain (I live in the U.S., spoke English all my life with a native English speaking father and my English could be better than my Spanish). Since I am Spanish, we use vosotros. While I heard people in the U.S. learn “ustedes comen”, I would say “vosotros coméis”.
It depends on the dialect and even the age of the speaker, tho. For me (from central Spain, late thirties) ‘usted’ sounds really archaic, like using ‘thou’ in English. I’ve never used it, no matter how old or ‘important’ the other person is. My coworker (also from central Spain), in his 50’s use it quite often to address customers or the company CEO, and it feels weird to hear it in an accent kinda similar to mine from someone not that older. In the southernmost part of Spain they use it a lot, even young people in informal settings, specially in the plural (‘ustedes’).
Well - I suppose I am officially archaic then :D I learned ‘usted’ as the very normal polite form of address in central spain from actual university teachers. In the 90s, admittedly ^^