What is the advantage of using proxy server with meteor?

I’m curious of what the pros is when using proxy server as either nginx or apache with meteor.

Is it making better performance when serving assets on proxy server rather than meteor server ?

If it is, which one is better between apache and nginx for meteor ?

I too am interested in this. I seem to remember reading once that sticky sessions or websockets were not handled well by apache, compared to nginx… is that true? I have a sysadmin asking why we need to use nginx in front of the meteor apps when we already have a lot of experience with apache… any opinions or facts are welcomed!