Server Performance Comparison

[Nathan England]

Sorry to fan the flames but I am curious... We have had some talk lately 
about web servers and ubuntu/centos and various applications needing 
some version or another.

I'm curious, has anyone ever seen a performance comparison between 
similarly configured ubuntu and centos systems?

Should there be a performance difference? I'm sincerely curious here, I 
am interested about vps performance differences as well as physical 
server differences.

Nathan