Food business doesn't go out of trend. I guess try to research about your competitor first, and the most convenient location where you are planning to build a restaurant. Also, try to research about the food that you want to put on your menu, and the design of the whole chain. If you have a bigger capital I guess it will be way more better if you franchise a popular restaurant. It really depends on you, btw good luck and I am hoping that you'll be successful on your chosen line of business.