That depends largely on how you plan to use your selfie light. If you’re setting it up in one location and don’t plan to move it often, you might be better off going with AC power. It’s easier to use, always there, and costs less to run over time.If you’re in search of a more portable solution, USB might be a better option for you. USB cords can be used with a variety of devices, such as computers or power banks, and are much more useful in areas where there may not be a power outlet nearby.