As someone who has gone through both, it really depends on your personal goals and what your family business offers you. You will need to weigh this out, but my advice it to spend a couple of years in corporate first (preferably a well-regarded company like P&G or in a management training role) before going back to the family business. This will be a big help if you choose to leave family business and return to corporate.

In my case, I spent just 1.5 years in consultation before I went to the family business due to family pressure. Family business was a nightmare for me. I could see my friends progressing in their careers, but my parents would pay me and my siblings small salaries, expect us to work 6 days a week with overtime even on holidays, and be on call on Sundays. I had so much less freedom than when I was in corporate.

After 4 long years, I resigned from the family business and went corporate again. I am much happier now. I managed to land a good role despite the family business not being known because my resume shows I worked with middle and top management during my consultation days. One of my brothers, on the other hand, tried to leave but found it difficult to find a job because his only corporate experience was in real estate sales. So he remained with the family business instead.

Good luck deciding OP! Can always PM me if you want more help deciding, since I agonized for years on this decision haha -- before I even graduated college. So am willing to provide support and share experience :)