To be honest I use Atom mostly for writing Markdown. I am a paid subscriber for Webstorm, but I have found that I am using it a bit less lately and have been using Visual Studio Code a lot more, partially because I use TypeScript, love the intellisense and overall the editor is super fast and stable. Atom definitely has some slowness issues they need to overcome and ironically Visual Studio Code is based on Atom, but it is a great editor and there are a heap of plugins out there for it.

In terms of memory usage, Sublime would arguably win the fight (at least it feels that way). I think ST is also lacking in the plugin department these days as well, but I could be wrong about that. The interface of both Atom and VSCode is arguably better as well and maybe things have changed, but the ST3 betas have been pretty buggy in my experience as well. The native Git integration is also pretty great as well (especially in VSCode).

Sublime also lacks a native package manager of which VSCode and Atom have, but there is a third party package manager which works well, so it's a moot point.