oh, those two would be the minimum, you are welcome to add more. but only operating systems targeted at non-technical desktop users. so haiku maybe, but not BSD

and as a tech person, i would not care which linux distribution they choose. let the OEM pick one and use that as their differentiation point, if that's of any worth. ubuntu, fedora, suse, pop! os, whatever. it doesn't really matter, as long as there is an alternative to windows.