For end users today, is strongly recommended over any 1.5.0 dev build, as the 1.5.x branch is obsolete and unsupported.
The 1.5.0 dev builds were the first to make "up-scaling" feel seamless. Users could jump from the native 480i resolution of the PS2 to 4K (6x Native) with far fewer graphical glitches than in previous versions. pcsx2 1.5.0 dev build
However, historians and enthusiasts often look back at 1.5.0 as the version that fixed the "impossible" games. If you have an extremely old PC that cannot run the modern Qt-based versions of PCSX2, 1.5.0 remains a lightweight, highly compatible alternative. For end users today, is strongly recommended over any 1