Mechromancer for leadership! Yay!

I vote for the mechs, the zoms are too unreliable, one of them will wander into a turbine or capacitor or something and gum up the city's power production... also the mechromancer says there's only a 13% probability the human population will need to be culled in the next 50 years - lesser evil!!

Robots seem more practical/less messy, better aesthetically.

Humans are already more or less mechromancers, and being a necromancer implies some serious psychological illness. And it's very sad and unfortunate for all those zombies. So the latter.

Neither

Zombies, of course. Robots are smart and can betray me