I'm fine with buying both, but I much prefer to have physical copy than digital. Though these days I'll buy something of a quick play like a FPS digitally so I can quickly bring it up and something bigger as a physical copy .
Honestly 2019 most likely would have been a good time, but with the release of PS4 Pro they kind of need to extend the age of the PS4 life cycle. So I would say 2020/2021 would be better.