I recommend trying Mame32 Plus! Plus! version 0.119 for titles that do not work on MAME .175 or approximate.
Confirmed working for 19XX, Alien vs Predator, Punisher, Armored Warriors

If you are having trouble with a Neo Geo title, try WinKawaks.
Confirmed working for Metal Slug 5 and 2020 Super Baseball

The above were all games that did not work on the latest version of MAME.