This depends highly on the consumer. If you would like to make an app, I would suggest finding a target audience first as it is essential to know what kind of people you are marketing to. If you just want to make a lot of money- think of everyday apps that anyone can use. There is a very big market for gaming and in game purchases have high potential to move the game forward. Practical apps that help you perform certain things such as backup, quick video editors those are useful for everyone and you can find those easily everywhere, but you need to look for an app that everyone finds tedious. Ask your family and friends. As for productive apps, those might be more useful in the commercial aspect and they have a lot of income potential, and its market would definitely be large. Its up to you to decide what your target audience is and ask around to find what people find missing in terms of their apps.
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