I'm using the wide screen (16:9) format simply because I like the look of the images that way. If I'm going to zoom or crop the image I'll use the higher resolution (4:3) just so I'll have a higher pixel count to work with. Been using both apps, stock and Google camera, and like the tap to focus with a shutter button better on the Google app. Both seem to produce about the same quality image so it's really a toss up since they have very similar features.