The most important question when you’re choosing a web server setup is how you’re going to use the server. If you’re going to be serving a single site and this server is dedicated as a web server with a separate database server, you will likely be able to find some gains by using nginx over Apache if you have high traffic. As an additional benefit, nginx has configuration features which make it easier to scale than Apache if necessary. But Apache has its advantages. It’s a mature and capable platform and pretty much has universal support in the linux world.