Recs.
Updated
SpecsUpdate
Pros
Pro Haven't found a WM that beats e16 in 20 years
I've been using e16 for about 20 years and tried quite a few other WMs, but always returned back to e16. It's fast, doesn't use much resources, is highly customizable and is rock solid (I cannot remember it crashing). Its combination of simplicity and beauty is unmatched.
The default theme on e16 is kinda disappointing. Try B-42 or Dark-One.
Be careful if you enable Composite. It works flawlessly, but you can screw your menus when playing around with the transparent settings in the settings menu. Making a backup-copy of your .e16 preferences beforehand might save you some trouble.
Pro Lots of themes available
There is a large selection of themes available for the Enlightenment window manager which means customizing to ones preference is an easy task.
Cons
Con Minimal set of utilities
Enlightenment only comes with the bare essentials, meaning there is not much upon first install that can be done in comparison to other more fully featured desktops. This of course leaves all the customization of what apps to install up to the user, which may be a plus to some and is directly comparable to most other bare bones Window managers.