Want to make the app look native but keep the ability to toggle the Chrome dev tools? Throw the toggle in the system menu! Here we cover a few gotchas when setting up menus in a NW.js app.
Both are great. NW.js makes some of the native OS features easier to work with--at least it was easier six months ago when I first looked into each platform. This SO thread has some good comparisons: http://stackoverflow.com/questions/23731517/what-are-the-functional-differences-between-nw-js-brackets-shell-and-electron