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In terms of RAM usage Node.js is better then PHP.
I would prefer Node.JS for Chat, multiplayer game using web socket .
And Its the Frameworks, not the language which typically introduces the security enhancements .
Finally its the requirement which can take the decision upon the framework.
The main thing is Node is Non-Blocking. You can find the more info on below link.
http://www.hostingadvice.com/blog/comparing-node-js-vs-php-performance/