Tactics for Necropolis.

I would like to ask the Necromancer experts on WT: 111 – what is better, upgrading skeletons or using a transformer and filling it with zombies? I am inclined to keep the zombies as they are relatively "meaty," is this correct?... And I would also like someone experienced to share how to best use vampire lords, approximately how many of them should there be so that they can handle things on their own (including clearing out live guards), i.e., eliminate a significant portion of the living defenses (maybe except for Dragon Utopia, ГО, and similar factions).

http://ru.twitch.tv/mrlefish/b/346341438 Here's a stream by Lebron where Gosha, level 14-14 armor expert, takes on level 117 Dragon Utopia mini with 24 lords (without experience) + single units; he only uses magic shield on round 3... We all learn from each other :). Level 2x probably wouldn't have been so easy, although repeatedly casting the shield might have helped him pull through:/