Why do you classify the BSDs as Unix and not Linux as a Unix? Linux has about as much right to be called a Unix as the BSDs do, as those BSDs have had to be stripped of pretty much all Unix code in order to comply with the AT&T v. BSDi court case from 35 years ago[0].
Further, the BSDs were more popular than Linux at a point in time. There's a very good reason why Linux won the platform wars, and a very large part of that reason is because of the GPL - a difference with the BSDs which wont be going away.
Further, the BSDs were more popular than Linux at a point in time. There's a very good reason why Linux won the platform wars, and a very large part of that reason is because of the GPL - a difference with the BSDs which wont be going away.
[0] https://en.wikipedia.org/wiki/UNIX_System_Laboratories%2C_In....
[EDIT: Typo. Added citation.]