Back to this topic... are really zombies more aggresive and skeletons more defensive?
I tried a necromancer book based around [mwcard=DNQ05]Libro Mortuos[/mwcard] and [mwcard=FWQ09]Sectarus, Dark Rune Sword[/mwcard]. I went for skeletons, 6 minions plus some more variety. The idea is bring libro and death ring first turn, drop two [mwcard=DNC15]Skeletal Minion[/mwcard] second turn, and from there go jump onto the other mage, keeping droping skeletons from libro every turn, and using Sectarus for action advantage (if going mele, is gives +1 channel, +1 mele +1 piercing and opportity to get curses on opponent for a 10 mana quickcast), in something similar to a swarm rush.
In such a book, i think the skeletons hability to both hinder and doble move to get in touch when needed gives them more 'punch' than an similar zombie book. Zombies punch harder, but skeletons will punch more often, which i think will result in more damage dice. Of course you can vary using specific combinations... but i donĀ“t see clearly zombies as more aggresive.
In fact, if i planned to have a slow build up, i think zombies would be the best aproach, since enemy is forced to come to you, and then their higher attack will overcome the lost attacks due to thier lumbering and pest traits.
I just had a couple of plays of my skeleton book... but it seemed that the rush could not be archieved by using zombies.