How would you create value for the product or service if you were the entrepreneur of the new venture?

What would be your choice if posed with the decision between starting up a new venture or buying an ongoing venture if you have an opportunity to be an entrepreneur? What are the considerations that would help you make the decision?

-Identify a product or service and assess the business opportunity for a new venture in that market. Is there a good opportunity for a new venture? Why?  How would you create value for the product or service if you were the entrepreneur of the new venture?