MAME 0.139u1 is widely considered a "balanced" version that offers a compromise between accuracy and speed Performance:

But what exactly is the "Archive Patched" version, and why do people search for it? Here is everything you need to know to get your retro gaming setup running smoothly. What is MAME 0.139u1?

In the world of arcade emulation, certain MAME releases become landmarks — not always for what they officially added, but for how the community responded to them. (a u-release, or “update” between full versions) holds a peculiar place in that history. It arrived in an era when ROM management was shifting, and “patched” ROM archives began circulating more widely than ever before.

While MAME is updated monthly, version 0.139u1 achieved a specific status in the emulation community because it served as the codebase for Final Burn Alpha (FBA) for many years. Consequently, when manufacturers began producing retro handheld emulation devices (such as the Dingoo A320, GCW Zero, or early Anbernic devices), they utilized the FBA core, which was based on MAME 0.139u1.

For those of you still rocking older hardware or specific mobile builds (like MAME4droid), I’ve put together/found a cleaned-up resource for the MAME 0.139u1