Server Mode Differences between PHP & NodeJS?

Hi - I was wondering if there are significant differences between the PHP & NodeJS server models in terms of supported functionality. i.e.: Is one more or less supported than the other or does one have some piece of great functionality that the other does not have or is one more likely to be supported or dropped in the future?

Another twist to the question - what are the things I should consider in choosing one vs the other?

Thanks very much!