When comparing XDM vs Entrance, the Slant community recommends XDM for most people. In the question“What is the best Linux Display Manager?” XDM is ranked 4th while Entrance is ranked 10th. The most important reason people chose XDM is:
It's a lot more lightweight than the most common GTK or QT based login managers.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Lightweight and fast
It's a lot more lightweight than the most common GTK or QT based login managers.
Pro Allows several seats
Pro Matured Software
XDM is not new, it has been in development since the 80s and is a very stable
reliable DM.
Pro Flexibility
Very customizable and portable, although with not as advanced effects.
Pro Does not need Systemd
So it can be used on other unix-like operating systems besides linux without the need for linux bindings.
Pro A Sandbox
Entrance is probably the most configurable and themeable display manager available.
Cons
Con By deault you can't choose desktop environments
by default you can't choose your sessions/desktops, however there are plenty of tutorials on the web to add a selection.
Con Edje is hard to master
EDJE *.edc files are CSS-Like code that is hard to master:
https://www.enlightenment.org/_legacy_embed/edcref.html
