Dual Universes

[Root Boy Jim]

Some vendors have "dual universe" machines, where you can
pretend that you're on a machine running Berkeley Unix or
one running System V. Other vendors start with one as a base
and add features of the other. Of course it is easy to just
add missing pieces; the hard part is resolving conflicts.

Given this state of affairs (pre POSIX) how do y'all feel
about the relative merits of dual universes vs merged systems?

Which model do you think serves customers better?
-- 
		[rbj at uunet 1] stty sane
		unknown mode: sane