What's your end goal? If you want to make lots of money go for a B2B product, something that big or small businesses can use. And that more often translates into your product's ROI, i.e. the amount of time + money they put into it vs the amount of money, traffic, leads, time, etc it generates or saves in return. Your customers will beg to signup if your products gives a ROI over 4x.

I never build cool products anymore. I just think in terms of ROI from customer's point of view (it also helps to compare your product's ROI with existing products). This also helps me write very good sales copy too.