Most 'pre-installed images' are classed as shovelware. Cram as much as they can onto an SD card with no actual effort in getting it running correctly first and with minimal, if any, after sales support including systems that most people won't want or even use and also won't take full advantage of t he RetroPie

Some systems are as 'proof'. It works but don't expect much, if anything from the emulation. Good examples are 3DO or SEGA Saturn and PSX2. They WILL run, but not at any speed worth trying to play