Yes I agree with most of this and would add that, for hot water, the PPR pipe has very poor thermal conductivity meaning that the water in the pipe stays hot for longer.
The UV resistant comment is only true for specialised PPR pipe which has been treated. Unless you are absolutely certain that your PPR is UV resistant you had better keep it away from sunlight.
I had some left-over PPR which I used for aerial cable support rings because I thought it was UV resistant.
During the 5-6 years of daily exposure the rings have almost completely disintegrated whereas other PVC blue pipe similarly exposed is merely discoloured and probably brittle.