&gt; why they&#x27;d choose Ubuntu over CentOS or RHEL<p>Maybe they&#x27;d actually used them before.<p>CentOS is a turd of a distribution, I&#x27;m certain the only reason it has any marketshare is because it&#x27;s the only supported &quot;free&quot; OS for cPanel&#x2F;WHM which a lot of web hosts provide for non-technical customers.