The Photos app in iOS 13 is now good enough that you may never need another app to edit your photos, for regular edits at least. Somehow Apple made the app even easier to use, and added some new features, while making existing features far easier to find.
For instance, Portrait Mode now gets its own tab; the automatic magic wand tool can now be fine-tuned (as can the built-in filters); and the crop tool now fixes perspective, and mirror-flips your photos.