Here also went looking for the options to protect the paint.
Thought there are already a few pending posts.
I myself go for the PPF at least on the front and side mirrors.
In my opinion a 1-time edition where you have a 10 guarantee on the foil.
And thus also protects the paint against stone chips and etc. This is less successful with only a polish or lacquer seal.
Eventually if the stone is big enough damage will occur.
But with a plastic protective layer, the chance is a lot smaller.
Also before opening the doors against your car, a layer of plastic will better protect the paint and make the blow duller.
I have already approached a company that does this work. He indicated that he could also indicate himself which places should be treated best with PPF. So that you don't need the whole car.
This video is also interesting.