APPLE IPHONE 6S PLUS
The iPhone 6s Plus has the best camera UI for most people. It’s easy to use, makes sense, is fast, and its auto-focus is spot on most of the time. You can control exposure easily by tapping the screen for focus and sliding the brightness slider that appears. You don’t need to go into any secondary menus to do things like panoramas and slow-mo.
But it pays for that simplicity at the expense of sophistication. There are no advanced controls. Settings for video resolution are hidden away in the iPhone’s Settings app, which I doubt most people would go into.