Originally Posted by TidalWave

If you're asking the question than it doesn't really matter and you should let the people managing your machine make the decision.

as Rowan 1 post above me said, it really makes no difference. you won't really see a increase in performance in any of the O/S. Anyone who tells you otherwise is just exaggerating things. real world it doesn't matter. whats more important is making sure everything is secure, updated and optimized (which most relies on apache/mysql/php being optimized which has nothing to do with the OS).

if you want a performance increase that is noticable switch from Apache to Lighttpd.