In my experience, even with all the options turned off or uninstalled, w2k adv server runs slower than w2k pro.
I don't know about advance server, but server runs games great. HOWEVER, you must not only turn off the many services. The crucial step that most people don't do is this: you must also change your performace options to optimize performance for applications over services. It's a server os, so that's why services take priority as the default.