Much better on opening a business because its lesser on risk. And your income will depend on how you approach your customers and its possible to gain a consistent profit on it. Not like on cryptocurrency its takes a lot of time and risk before you get a profit. In business you can get daily profit that will sustained your expenses for yoir everyday need not on cryptocurrency. Maybe you can put small amount of profit on your business and invest on cryptocurrency. With that atleadt you do both in a lesser risk.