FreeBSD network stack Vs others

[ithilgore --]

 I 'd like to learn what are the basic differences ( pros and cons ) between
the
FreeBSD network stack and the other OSs' ( especially linux )

I know that linux has had everything rewritten from scratch as far as the
implementation of tcp-ip and the sockets are concerned and would like to
know if this has made it actually more robust or state-of-the-art than
FreeBSD's or the opposite.

Some actual technical details and references would be appreciated.