什么时候线程框架比事件驱动框架更好？ （即什么时候rails比node.js好？）

I understand what a threaded framework is (Rails, Django, Symfony2, …). And I understand what an event-driven framework is (Node.js, EventMachine, Twisted, …) and why it's great for live, chat, speed, … In addition they don't seem to cause problems for normal use cases. So:I understand what a threaded framework is (Rail