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”.
¡Qué interesante! Vivo en Estados Unidos y no se usan aquí. Intento usar “ustedes” con gente pq es más usado, incluso si ya conocen la palabra “vosotros”