Both options are good. I think for the most part it boils down to wanting a single product or suite of products.

While you certainly can get just one proton service, the idea of having an easy entry point into multiple privacy focused solutions is what they are going for.

The pro argument for that is cheaper overall, simpler to get into and mange, etc. The con argument is an eggs in one basket philosophy isn't ideal because you can have a single point of failure. This is all subjective to your personal threat model.