Unfortunately I do not have one of those videos, my experience with youtubers is that usually they do not go in depth.

The most powerful wm's can be the ones based in tags(instead of workspaces) like dwm and riverwm, but they are conceptually harder to wrap your head around them and can be of higher cognitive effort than regular workspace wms.

Window managers potential varies and even more so with your personal workflow. I would suggest checking the window manager for:

• tag/workspace based
• window tags(for workspace based)
• window/workspace/tag movement
• layouts
• window tab/group
• input support
• output support
• decorations

The most important ones are workflow related because you cam always have a hotkey daemon running if the wm's input support isn't as good.

Here are my dotfiles, none of those wm configs use all features but you get the idea.