Perfmon essentially allows you to define commands you use daily, defined them in a toml file and tab them, ie customizable. It could be docker or kubernetes commands and so on. This is different from btm.

Bottom(btm) gives just more graphical than top.

Ha, I've literally never heard of bottom, and haven't looked it up yet, but it's just kind of funny doing Linux/Unix forever and knowing almost exactly what it must be about, just given the name. I'll edit this if I was wrong, but I bet I won't be.