When comparing monsterwm vs Window Maker, the Slant community recommends Window Maker for most people. In the question“What are the best window managers for Linux?” Window Maker is ranked 17th while monsterwm is ranked 42nd. The most important reason people chose Window Maker is:
Different from any other WM which makes it a lot of fun to use.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Supports multiple monitor setups
Monsterwm has built-in Xinerama support for multiple monitors.
Pro Floating mode support
Monsterwm has floating window support, made possible by entering floating mode when re-sizing windows.
Pro It's unique
Different from any other WM which makes it a lot of fun to use.

Pro Lightweight and elegant
Window Maker is a very lightweight and elegant desktop with a dock for windows handling.
Pro Rare, retro feel
The look of Windows Maker is reminiscent of NeXT's GUI and should be appreciated by those who enjoyed it for its retro feel.
Pro Extensible with dockapps
Dockapps are available to extend the functionality of Window Maker.
Pro Actively developed
Window Maker is in active development. New features are added and bugs are bashed on a continuous basis.
Cons
Con No runtime config file
There is no runtime configuration file, so any changes made will only be visible when the session has been reloaded.