Full Non-Merged: This is the easiest to use. Every zip file contains every single file needed to run that game. You can delete games you don't like without breaking others. It takes up the most space.
The 0.78 set is famous for arcade games. Examples of games that worked very well: mame 078 plus romset
The Ultimate Guide to MAME 2003-Plus (0.78+) Romsets If you’ve ever dabbled in retro gaming on a Raspberry Pi or a handheld like the Miyoo Mini, you’ve likely encountered the MAME 2003-Plus core. Often referred to in community circles as the "0.78 Plus" Full Non-Merged: This is the easiest to use