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; though that slider is a bit of a small target. You don’t need to go into any secondary menus to do things like shoot panoramas and slow-mo.
But the iPhone 6s Plus pays for that simplicity at the expense of sophistication. There are no advanced controls, and even third-party apps can’t do much with the iPhone 6s Plus’ camera except control the shutter speed. Settings for video resolution are hidden away in the iPhone’s Settings app, which I doubt most people would go into.