Gentoo Linux

It depends on what you need your WM to do, really. In practice, usually you just patch everything you need one day and then forget about it. There is a website with sorted patch list with description and everything, if you're interested. Sometimes I can even modify the source code and add or remove stuff, since the code is small and it compiles in seconds. But it's a dynamic tiling window manager and no patch will change that, if that's not what you like that's totally fair. Also, updating might be painful.

If bspwm does what you need it to do, and you don't feel like you want to add or remove something from it, just stick with it.