What should you do, edit photos or add a filter?

There is no harm in any of the options. You can add pre-defined filters to your picture or edit them later. But, we strongly believe that don't just blindly follow what others are doing. If you want your pictures to be unique and different from other then you must edit them or else use those filters readily available on the apps you use. Whole world is adding same filters to there pictures, making them look similar. If, you ask us, this is the last thing we would ever do to our pictures. It is always better to use any image editing app that just works brilliant on phone. Apps like photoshop express, SnapSeed etc. allow you to make edits like adjusting the contrast, brightness, sharpness, color temperature etc. Its similar to editing pictures on your computer when you capture them using your DSLR or any other point and shoot camera. With these type of editing practices you can actually develop your own style.And yes, it requires lot more efforts than just pick a filter to apply. But, if you seriously want to improve your phone photography skills, then you must edit pictures instead apply a filter that everyone else is using.