Undead, as monsters or as templates?

[Anthtriel]

Specific monsters all the way, no templates.

Then, especially interesting and complicated undead, like Vampires and Liches should get a one or two page writeup for use as PCs or special NPCs. Just a few of the most iconic powers, so you can treat it as multiclassing.

 

[Lord Zack]

I think it should vary from case to case and some might even have both. So you can use the base stats for elf, orc, human, ect. zombies and use the template for hydras and such.