>>118
MX-21_ahs_x64.iso is a special 64bit version of MX with newer firmare and graphics drivers than what is found in our standard releases. Use this is your hardware is relatively new (10th generation intel, amd ryzen graphics, etc...)
MX-21_kde_x64.iso is a "ahs" based release featuring the KDE dekstop.

ttps://ftp.riken.jp/Linux/mxlinux-iso/MX/Final/Xfce/README.txt