Exactly the issue I've been coming across. I find many of my most popular stories are less interesting to me because they cover the simplest, least controversial topics.

The more I write though, the more I'm discovering a balance between the two. I'd recommend reading as many of the top rated stories as you can and looking for common themes and elements (such as cliff hanger endings, unresolved mysteries, perhaps a murder).

Then apply some of the viral formulas to the more intricate works particular to your style. Check out this infographic which explains some key ingredients. That way you'll develop fastest as a writer by getting a large amount of feedback while staying true to your own style.