No, neither is a fundamental right. Because both growth and degrowth as a national policy (or global international policy) has immense consequences on the opportunities and outcomes in peoples lives. Both stifle and regiment the lives and actions of people in a myriad of ways (climate change is a massive externality for everyone!), so anti-stifling arguments have no traction. The only arguments that can do real work will have to concern policy consequences: which policy yields better life outcomes in terms of health, wellbeing, longevity and so on.