Warhammer II, Mortal Empires or Normal campaign?

Ok so just to let everyone know, i just finished through Warhammer I a week ago and loved it. Now iv just bought Total Warhammer II and i noticed that it's got the mortal Empires campaign which includes everyone

As someone who just bought the game, should I first play through the normal warhammer II campign or go strait into Mortal Empires?