Ask HN: Can anyone provide insight on apple App store categories

We are getting close to completing a iOS app and are trying to determine the correct categorization. I am currently going back and forth between social networking and lifestyle, here is my question. - Lifestyle has significantly more apps than social networking, but social networking has a majority of the most popular, and highest net worth, apps. Can anyone provide some insight on choosing a category, or perhaps on the competitive vs. volume distinction. Thanks,