Utah should not be going to SCOTUS because sexual issues are under states’, not federal, authority. Instead, IMO, Utah should nullify the federal court’s ruling because it is outside constitutional federal authority.
Arkansas tried that in response to the federal courts' desegregation rulings in the 1950s, and President Eisenhower federalized the Arkansas National Guard to enforce the federal courts' orders.
Before anyone flames me, I am not comparing same-sex marriage to desegregation; I am just pointing out that a state can't decide on its own to nullify a federal court order, if the President is willing to enforce that court order.