Sorry to come into an old post, but I've just signed on to this forum.  My games group have been playing KoW regularly and having a lot of fun.

To add to the discussion, don't forget that with Warhammer, there is a very expensive rulebook, versus Mantic's free rules.  Also, you can't necessarily play WHFB with one battalion box...an army is probably going to be composed of several battalion boxes.  Mantic boxes allow you to start play immediately (short of assembly and painting) at a low points count.