If you prefer to hold your phone vertically, then you want a 4 x 3 aspect ratio. If you like to look at your photos on your phone horizontally, then you want a 16 x 9 aspect ratio.,
Also, look at his eye, he’s looking right at me. I think he figured out my iPhone wasn’t a fish. I have the white one and the camera lenses look like the eyes of a fish. I had to crop it some, it’s a fame capture from a video clip, I’m a terrible wildlife photographer.