[medo-bear]

Common Lisp in Doom uses Sly. If you want to stick to Slime and prefer vim ergonomics to those of Emacs there is also Spacemacs, which I just learned even has its own Wikipedia page: https://en.m.wikipedia.org/wiki/Spacemacs

[sandbach]

That sort of thing is all configurable. It's easy to tell Doom Emacs to use Slime instead.