Is there any advantage to upgrading vm hardware version? I have two hosts running Esxi 5.1 that I want to upgrade to Esxi 6, some of the vm's are running versions 7, 8 and 9 hardware versions. I want to be able to still use the Esxi client and not bother with a vcenter server if I can, so I believe I should not go higher then version 9, is that correct?