Yiming Chen has an interesting post that compares Doom Emacs, Spacemacs, and vanilla (i.e out-of-the-box GNU-) Emacs. Chen approaches the subject from the point of view of a Vim immigrant who is heavily invested in the Vim keystrokes and mindset.
Until very recently, I hadn’t even heard of Doom Emacs but it looks to be an excellent configuration for someone who wants to live in the Vim environment as much as possible while still using Emacs. The other choices offer similar functionality to the Vim user. You might wonder why anyone would bother. If you’re most comfortable in the Vim environment, then use Vim. The most common reason you see is to get access to Org mode and that’s certainly a good enough one. Doubtless there are others.
Those who want the Vim experience in Emacs have at least the three choices that Chen explores. If you, too, want a Vim experience from Emacs, take a look at Chen’s post. He gives the pros and cons of each choice as he sees it. You’ll have to follow the link to see which one he chose but it’s worth the read in any event. Even if you aren’t looking to bring Vim with you.