When comparing CDM vs LXDM, the Slant community recommends CDM for most people. In the question“What is the best Linux Display Manager?” CDM is ranked 3rd while LXDM is ranked 9th.
Ranked in these QuestionsQuestion Ranking
Pro Has almost no dependencies
Pro Supports virtually any DE/WM
Pro Very lightweight
takes up near no system recources.
Pro Works with Nvidia
Works well with Nvidia.
Pro Only two dependencies
Only needs GTK and Xorg-Server.
Pro GTK2 and GTK3 versions
Pro Fast and fluent
Pro Works well on USB
A full install of arch on live USB works well on many computers with no text issues with LXDM.
Con Bad availability in distros
There is no CDM in distros repositories (only in AUR on arch)
However you always can compile it from source.
Con Curses-like interface
Very simple and minimalistic graphical interface.
Con Requires Xorg-server
Currently LXDM does not support wayland.