I really enjoy typescript and I really enjoy the cutting edge features. Atom editor is the only editor that has the typescript plugin that works with the latest features of typescript. I hate the performance of atom but it is worth the tooling.
I use them both back and forth for a current TS project, and I think both are very good.
I think the Atom plugin is a little bit better in the "help you and show errors as you type" department. With VS code I have configured a gulp compile and VS Code Task with problem matcher configuration, but that is a little bit slower than the Atom plugins compile/build on save configuration and sometimes doesn't show errors on the correct place. But that might be my configuration, so it could be better than I think.
What Atom also supports and VS Code not is the glob expressions for included files in tsconfig.json.
However most of the time I'm currently preferring VS Code, because the editor is just much more responsive (although Atom got better with the 1.1 update).
Another important thing is that VS code supports node.js debugging (with js and ts), which is really helpful.
