For the best compatibility on RetroPie, look for or FinalBurn Neo sets.

Not all ROM packs are created equal. A beginner might download a 200GB pack only to find that 80% of the games are broken, in Japanese, or simply "shovelware" (bad games). A top pack has five key characteristics:

"Top" ROM packs for RetroPie are more than mere collections of files; they represent a community-driven effort to curate the history of digital entertainment. By streamlining the technical barriers of folder management and file extensions, these packs allow users to focus on the preservation of gameplay experience. However, the future of these collections depends on balancing ease of use with the legal realities of software copyright and the technical constraints of Raspberry Pi hardware. Transferring Roms - RetroPie Docs