The answer to whether .pkg files are "better" on the PS3 is nuanced. To provide a definitive answer, we must first distinguish between two different methods of installing content on a modified PS3: the standard and the ISO format .
We need to address the elephant in the room. Searching for "ps3 dlc pkg files better" often leads to forums discussing backup managers.
: Unlike game ISOs or folder-format games that often need to be "mounted" using a manager like multiMAN or webMAN MOD, DLC installed via .pkg is always "live." You don't have to trigger a mount every time you want to play.