New units in Necropolis. Discussion and selection between upgrades.

Personally, I think that almost all the new units are better than the old ones, and I will give you an example of which vampires I choose in the game when playing as a Necromancer.
1. Skeleton Warrior
2. Plague Zombie
3. Spirit
4. Vampire Lord
5. Greater Lich
6. Death Herald
7. Astral Dragon