Si, me gusta. Pero prefiero (prefer) argentina. This is because when you say “prefiero”, “yo” is implied. Like I’m English when we say “he is stronger than I” because it is implied that we are saying “he is stronger than I am
Un is 'a,' masculine. Una is 'a,' feminine. Unos means 'some' or 'a few, ' masculine. Unas means 'some' or 'a few, ' feminine. That is just the answer. Enjoy