if I can't choose I will do both. open a real business and invest. investing in crypto doesn't take a lot of time. so we can check coin price movements while maintaining our real business. and in my opinion do not rely on crypto investment as the main income because the crypto market is unpredictable. so we need real business or real work as our main source of income.
Opening and runing a new business is not easy at all and it has same risk as investing in crypto currencies. I think not every one has the art of running the business. I will suggest to go for the crypto currency investments.