I live by VSCO for all my photo edits. The interface is easy to use and simple. They have LOTS of free, quality filers that you can apply and editing capabilities that help enhance your photos. Another feature that's really helpful is that you can save a "recipe" of all the edits you made to one pic, and apply that recipe to any of your other photos for a uniform aesthetic. You can also just copy and paste your edits with two taps to apply the edits you made from one picture to the next. I personally don't pay for the premium version, but with that comes more filter options and the ability to edit videos. For me though, the free version has worked great!