This is a question about game balance, something that I’ve realized while playing on Iron Crown. Due to varying sizes of gravesites depending on the race of the settlement, certain zombie armies are simply not playing to their intended strengths.
Currently with the way the game is, my ranking of zombie army strengths are as follows, and I will explain why I rank them this way further below:
Orcs (Strongest) 14 strength large pop (200-600)
Humans 12 strength large pop (200-600)
Dwarves 18 strength medium pop (200-300)
Trolls 20 strength small populations (50-150)
Elves 14 strength small populations (50-150)
Goblins (Weakest) 8 strength small-medium pop (100-200)
This seems like a mistake, as the slow speed of the Dwarves and Trolls necessitate they have the strongest armies to compensate. I recognize that each individual zombie is stronger, but the rate at which they spawn is much worse.
Because humans and orcs have such substantially larger population settlements, while the % chance to spawn a zombie is the same, the number of zombies exposed to that percentage is larger. This results in the humans and orcs reinforcing at 4 times the rate of Trolls. Dwarves fair better, as their normal settlements have the same population sizes, but still usually reinforce slower due to the 600 pop cities of the orcs and humans.
As for the faster zombies, this seems fine. Their only hope is to blitz quickly and capture (hopefully orc or human) settlements, but their speed makes them difficult to manage effectively. They produce the smallest strength armies of all the races. And the goblins, getting a bonus on both swamp and forest, make them more versatile.
Of course, it is entirely understandable if the intention is for certain zombie types to be simply unequivocally more dangerous than the others. If this is the case, then I pity the race that starts by an orc zombie. But I believe it would be more interesting if each zombie had its own strengths that made them a threat. In the case of the fast zombies, I think this is successful. But I believe the slow and medium races need to be looked at, as the slower races are more manageable and less dangerous.