I think first - The mother tongue- it has extra touch of comfort & sense of belonging while communicating..! We have great litreture in every language & to have the child a willingful access to them they have to love their mother tongue.
Global Language has to be learnt so that you don't face limitations anywhere.
National language gives you joy pride of being & interacting with citizens there..
After all human being is a social animal & more the ways of communication you know better you enjoy life around you !