I vote Necrons
Smokes will be irrelevant for this battle, but that many shots will easily down those tanks. There's no urgent need for monoliths, so one could deepstrike, stranding the cc units on the wrong side of the field.
The deathguard have no way to take down a monolith, so rerollable WBB saves will be a given and the necrons won't stay in cc much longer than a round.
If a monolith deepstrikes, it can easily and quickly destroy those predators who will presumably be trying to take out the monolith (extremely unlikely) or wittling away the warriors (who get WBB twice anyway, so it isn't that useful).
Then, when a squad of warriors teleports, they can ensure the destruction of any surviving predators.
Smokes will be irrelevant for this battle, but that many shots will easily down those tanks. There's no urgent need for monoliths, so one could deepstrike, stranding the cc units on the wrong side of the field.
The deathguard have no way to take down a monolith, so rerollable WBB saves will be a given and the necrons won't stay in cc much longer than a round.
If a monolith deepstrikes, it can easily and quickly destroy those predators who will presumably be trying to take out the monolith (extremely unlikely) or wittling away the warriors (who get WBB twice anyway, so it isn't that useful).
Then, when a squad of warriors teleports, they can ensure the destruction of any surviving predators.