While "ROM" is the catch-all term for game backups, the is a far more sophisticated beast. Between its native stability, its ability to bundle DLC and updates, and its superior compression, it is objectively the better way to manage a PlayStation 4 library.
The primary reason PKG files are "better" is that they are the native format used by the PlayStation 4 itself. Unlike an ISO, which is a raw disk image that requires a "wrapper" or an emulator to translate data, a PKG is essentially a container that the PS4 operating system (Orbis OS) already knows how to read. ps4 pkg roms better
No overhead from mounting disk images.
PKG files, conversely, are compressed archives. They only contain the actual game data, assets, and code required to run the game. This means: While "ROM" is the catch-all term for game
Why PS4 PKG Files Are the Gold Standard for PlayStation 4 Emulation and Modding Unlike an ISO, which is a raw disk
As PS4 emulators like and fpPS4 continue to evolve on PC, the PKG format remains the preferred input. Because PKGs contain the decrypted metadata of the game, emulators can more easily parse the file structure to trigger the execution of the game's .elf files. For users looking toward the future of preservation, building a library in PKG format ensures your collection will be ready for the next generation of PC-based emulation. Final Verdict
For those using homebrew environments like GoldHEN, the installation process for PKGs is the peak of user-friendliness. Once your console is exploited, you simply place your .pkg files on the root of an ExFAT-formatted drive, plug it into the PS4, and use the in the settings menu.