you need an operating system now to create batter?
And no, linux/unix isn't "best" universally. The user interface for most users sucks for example, making it very bad for most people, especially those who're not expert computer users.
Maybe a simplified history of the Unix/Linux/OS X development is in order:
Ken Thompson and Dennis Ritchie put together an operating system so they
could play a space travel game on a spare DEC PDP-7 at AT&T Bell Labs.
They called it UNICS and later UNIX. The year was 1969.
Apple kicks out Steve Jobs, one of its founders, in 1989. Steve starts
NeXT Inc. and adopts a Unix like graphical OS. When he returns to Apple
in 1996 he takes along the X and Apple develops the Mac OS X operating
system which is first released in 2001.
In 1991 Linus Torvalds releases an open-source, Unix-like OS kernel that
he calls Linux. It is combined with GNU software and adopts a graphical
In all cases the graphical user interface is critical to make an OS successful.