Is the one you are carrying with you. In my case then, the iPhone 6 plus. Not bad, but very limited. I would love to walk around always with a camera that has more capabilities, but unfortunately, it doesn’t work that way.
In the past weeks it happened several times when going to the seacoast here nearby, and one thinks there is no reason to bring a better camera. And then suddenly the sun decides to create a magnificent spectacle. Sea for yourself.