If you’re using Wi-Fi choose Wi-Fi if you’re using ethernet cable choose LAN. Otherwise, you cannot able to access the PlayStation service and cannot able to play games on your PS4. Changing the DNS on your PS4 means there are limitations with your IP address so, you need to change your DNS to access PlayStation services.
The free DNS also works good but you can try them if they work for you. Most of the users are using free DNS because they don’t want to spend money. If you want to use free DNS you can also use free DNS on your PS4.
If you want to buy a premium DNS absolutely you can buy. There are hundreds of free and premium DNS servers available.
