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”.
Through high school we learned both. I took Spanish all 4 years, but had different teachers throughout that time. Most tests and oral exams would allow either, but I do remember some looking specifically for ustedes.
In university we mostly used ustedes, but I had a professor from Spain who would use vosotros. He never expected us to use it but everyone was expected to understand it when reading or in conversation.