Personally, I don't like to install anything to iLiad root file system, because it's not convenient to maintan with iLiad's input/output facility. Unless I have to replace/modify some files in root file system, I always put apps in MMC.
To be honest, I seldom use installable package for iLiad, although it's convenient. I fear that it will make some unwanted modification to my system. Since I don't know what the installable package does, I have to spend some time to figure out what happens and its cause.