i find why udb is better
here :
UDB has a native 64-bit build with several performance optimizations, better Linux compatibility, and an improved OpenGL-based 3D mode. UDB requires at least OpenGL 3.3 capability to run, whereas GZDB-BF, like other DB2 forks, rely on Direct3D, the rassons is on https://zdoom.org/wiki/Doom_Builder#:~:text=Ultimate Doom Builder (UDB),-A continuation and&text=UDB has a native 64,DB2 forks%2C rely on Direct3D.