The specific bindings vary by person and hardly matters, but having an extra modifier in the Command key is invaluable. It lets you properly "namespace" key bin

The specific bindings vary by person and hardly matters, but having an extra modifier in the Command key is invaluable. It lets you properly "namespace" key binds (ctrl and meta for emacs commands, CMD for global) and prevents hacks like copying text in terminal being different from copying text anywhere else (ctrl-c vs ctrl-shift-c in windows and linux, always CMD-c in macos).