Node is fast and AWESOME. It really depends on what your needs are. In my opinion, PHP is becoming a bit outdated. However, it is still the language that I can rapidly deploy something faster than any other language. I have a client who gets about 400k users a month and millions of pageviews. It runs really fast using PHP. It really depends on how you are going to set things up.
PHP has higher demand (but also a lot more competition) of work than Node.JS does.