OpenBSD vs MS (non trivial)

[Alfred Breull <puma@hannover.sgh-net.de>]

i'm looking for books, pointers explaining (-h, humanly) the
basical difference/-s between unices and microsoft osses. is
it the '4.4 bsd operating system' or are there better choices ?

i understood that unices allow users more freedom (and errors <g>),
when compared to i.e microsoft osses, or more stability, speed etc.

however, often enough 'fdisk /MBR' is suggested in pc's or win98
etc install fine while openbsd doesn't. 

i'd like to understand (1) the basical 'why s' and (2) the reasons
on 'why it is sometimes less problematic to rely on microsoft's 
solutions (i.e. fdisk /MBR example) than on openbsd's ' (absolutely
no flame intended).

thank you.