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”.
I was living in Spain for 25 years and there we would definitely use vosotros. Ustedes is used in middle and South America.
I believe it is common in some South American countries. Uruguay is one IIRC.