If you have a target demographic, think about how you depict that demographic. If your demographic is split, it might be in your brand's best interest to have a split campaign—maybe that means one commercial targeted at men and another at women, or one targeted at a younger audience and one at an older one. Coca-cola's 2015 Super Bowl ad targeted a wide variety of demographics in a single commercial that they then spun off into individual commercials, targeted more specifically through outlets most associated with that demographic and through online targeting. If you're advertising online, you already have the capability to target specific demographics. Why not create commercials specific to those demographics?