I have been to several synchrotrons, central facilities. Most had stock install of centos (whatever stable on that day). All user software was always installed in a nfs mounted /soft/+++
so that everyone could source it and use it. These days many of them are moving to 'xubuntu' (mainly avoiding the unity+gnome3 mess). Many of sci-devs are using ubuntu as their daily driver - so getting the latest python (bio), or math package, is newer in *ubuntu.