On an i3 computer with 4GB RAM, I recommend Manjaro XFCE. I run Manjaro KDE on faster computers, but XFCE on Core 2 Duo computers. With Manjaro XFCE, it's easy to install Enlightenment window manager, and switch from XFCE when the desktop gets sluggish. The Manjaro community is friendly on the forums. @k11m1
@k11m1 The response was based on your question about "Anything that is more responsive?" If you're on Debian, then shouldn't have problem with decoupling the desktop environment / window manager from the OS.
If you're already on bspwm, then should already know about Enlightenment.
I've usually been on Ubuntu/Kubuntu/Xubuntu , and switching DEs generally messes up both the original desktop, and the new desktop.
I'm not so bleeding edge as to require Arch. The Manjaro community has been more helpful to me than the Ubuntu community ever was.