I have an iPhone 7 plus. The camera is the 2 lens variety. How much photo quality would I lose if I switch to the new Xr? or would it be wiser to switch to the "old" 10 as I'm sure it will become the cheapest out of the new 3 choices. No HDR and the other new features on the camera but does that matter? So, new iPhone XR or iPhone X (this year's model) or keep the iPhone 7 plus?