When comparing XFWM vs WMFS2, the Slant community recommends XFWM for most people. In the question“What are the best window managers for Linux?” XFWM is ranked 12th while WMFS2 is ranked 34th.
Ranked in these QuestionsQuestion Ranking
Pro Can choose to open windows at center of screen or edge
Pro Integrated compositing manager
XFWM has an integrated compositing manager, though it does have screen tearing.
Pro Left-half/Right-half window snapping
XFWM has a built-in option for window snapping.
Pro Great and beautiful theme support
It's very easy to create themes.
Pro Lightweight and desktop independent
Pro Built-in panel
WMFS2 has a status bar built into the desktop. This implies that no extra app is required for users who like to use a panel on their desktop.
Pro Supports tabbed view
WMFS2 has tabs like i3 WM. The bottom tile has three tabs, with only one visible window. Press alt+shift+k (by default) to get a combined tabbed window.
Pro Multiple desktops
WMFS2 utilizes a feature called "tags" which is very similar to virtual desktops. With tags, WMFS2 can display multiple desktops in a singular desktop, as well as separate ones also.
Pro Easy to customize
WMFS2 uses a singular configuration file that is easy to edit and understand.
Pro Good mouse support
Re-sizing and moving tiled windows with the mouse is easy and intuitive.
Con Composite manager has screen tearing
The included composite manager in XFWM has screen tearing.
It should be mentioned that there's a workaround though:
compton --backend xrender --vsync opengl
Con Bug with tag numbers on Debian
There is a bug where the tag numbers do not highlight correctly on Debian (though this may get fixed in the future and may not be a problem on other distros).