I personally buy the physical copies, I have only downloaded 2 games on PS4, and those were because they were on a big sale at the time. But all of my PS4 games apart from those 2 are on disc.. one of the main reasons is if you buy digital and then don't like the game everything is lost, you can't get a refund or sell it or trade it etc etc. With the physical games I can sell or trade them
Just a little example.. I brought Ghost Busters for PS4 and the game is absoutley awful, I just didn't like it at all, very poor.. so I sold it on ebay for the exact price I brought it for. But if I had downloaded that game digital then I would have lost all my money. And there is no demo or nothing for it so its hard to know if you will like it or not.
Another example.. when I finished Assassin's Creed Origins on PS4.. I traded it with one of the guys I work with who wanted it and I took Lego City Undercover for my son who loves the game so much. But again if that was digital I wouldn't have been able to trade