LMDE, MX, Ubuntu etc are based on Debian. Mint is based on Ubuntu, so Debian. Chimera/Endeavour are based on Arch, etc.
In the linux world, you have a linux kernel, systemd or init, a bunch of gnu utils, a window system like X or Wayland, whatever DE you want (Xfce, gnome, kde, name it) and a packaging system (apt, yum, pacman), but for me, it’s all the same.
If you want something different, try a BSD distro then? FreeBSD, OpenBSD, GhostBSD, etc