I own the iPhone 6s but I'm not sure after a little over a year if I should upgrade- I want a bigger screen to manage stuff with... but I'm wondering is it worth it to upgrade or stay the same?
I suggest staying with it till later this year when a new iPhone is released. You have a great phone now unless screen size is that important. Have you tried using your phone in Zoom View allowing for larger app icons. Just a suggestion.
Just like @firedept10 said you might want to hold off until September. If the rumors circulating about are indeed true we are in for a major refresh with this year's iPhone.