I would not have preferred it if two girls were chosen - my latter points about equality made that clear.
However, if a school chooses to pick based on suitability for the role, I am surprised that two boys were chosen, as in my experience, girls tend to do better at secondary school level and they have more interest in leadership roles.
And while I agree that enforced equality isn't a great term to use, I'm sure most people would have understood me to mean that girl/boy equality was written into the school rules to ensure it happens.