As a recent owner of the PS4, I've decided that for this generation I will either buy all my games in digital or in physical discs. No half/half, it's one or the other for me. I decided to do a breakdown of which is better, and thought I should share it with you guys so perhaps it can help you decide which is better.
Digital Downloads (Pros):
-You get to play new releases the moment it's available.
-You have instant access to all your library without swapping discs.
-You have access to all your library when using remote play.
-You can take advantage of the PSN Store Sales / PS+ discounts, which are often pretty good.
-No TAX in certain regions.
-Doesn't take up space in your living room.
-More incentive if you have a fast internet connection and (or) if you've upgraded to a 2TB hard drive.
Physical Games (Pros):
-The ownership of a tangible media
-You can sell it after
-You can lend the disc to a friend or use it on other PS4's without having to login to your PSN account
-Authenticity of the game ownership is tied to the disc itself.
Digital Downloads (Cons):
-No tangible media. You're basically buying the rights to play the game similar to Steam.
-Cannot download your game if PSN network is down. (Has happened)
-You can't sell the game. It's forever tied to your PSN account.
-You can't lend your game (Share Play doesn't count)
-Risk of losing all your purchases if for any reason you get hacked/banned on PSN.
-Need to re-download the whole game if you delete the installation.
-Authenticity of the game ownership is tied to your PSN account.
-Uses a lot of bandwidth.
-No guarantee that Sony will host the games on their servers indefinitely.
Physical Games (Cons):
-Have to swap the discs when you want to play a new game
-Possibility of misplacing or scratching the disc
-If you want to do remote play, you're restricted to the disc currently inserted in your PS4 only. You do not have access to the entire library as you cannot remotely swap discs.
Verdict: I personally concluded that if money isn't the concern, digital download is certainly more convenient for not having to swap discs and allowing the access of your entire library for remote play. However, if you are more concerned about making a financially conscious decision, it seems to make more sense to buy physical discs as you can sell it later on when you beat the game; esp if it's a single player campaign orientated game.
Another dynamic to factor in is that if you often bring your games to your friend's house to play on their PS4 or if you often lend your games, physical disc is also the preferred option.
So for myself, I've decided to go with physical discs as it's the better investment for your hard-earned money at a minor inconvenience of having to swap discs when I want to change the game. I will buy digital ONLY IF there's a really good PSN sale where the price is low enough to justify the purchase.