the Apache web server has lagged in terms of performance during the last few years. MNPP can handle much more requests per second than Apache with PHP implemented as a module.
Seriously, is there anyone deploying something that requires high simultaneous requests-per-second on OSX? One click install is great for the development environment, but none of these are one-click installs on a cheaply scalable, which means Linux on commodity hardware, production environment.
But the easier it's made to create a development that is like the production is going to be a big win. As a systems guy whose team is in charge of that kind of thing, the fewer hoops, and thus fewer workarounds, that are necessary to get a complex system with a lot of different parts up and running for the developers to develop against, the better.