@stefano I would ask them what features they need.
this reminds me of one support call I had when I was working for Rackspace in 2013. The customer wanted Ubuntu instead of RHEL because "the dev told me Ubuntu has newer software and RHEL is too old for new stuff".... too bad all software versions were equal thanks to our backport repos... And RHEL had better support anyway (at least at the time, nowadays they are almost on par).