When comparing XFWM vs PekWM, the Slant community recommends XFWM for most people. In the question“What are the best window managers for Linux?” XFWM is ranked 12th while PekWM is ranked 31st.
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 WM with a build-in window grouping
Build-in window docking feature.
Pro Configuration is done almost exclusively via text files
'INCLUDE' directive in configuration.
Pro Start-up script
Pro Highly customizable appearance
Fully configurable: good themes support, screen background management with an external program.
Pro Support for keys chaining
For example, Ctrl+Alt+F, then Up Arrow = Focus Up.
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