This is an epic stompage.The Chaos King's army wins this.Here's why.
Zeus-We already know what happened when he was under the control of CK.He brought Galactus down.
Glory-This guy alone could take on Nekron's army.He's a 1 God army.He's composed of 10,000 Gods.Lets not forget that the writer of Chaos War:Thor stated Glory is like Odin w/ all the essence of Asgard inside him.Except Glory is malevolent and violent.And don't use the "Thor was able to beat Glory" scenario.The fact Thor had a plot device via TOAA through Becca's prayer.Nekron's army doesn't have a prayer against Glory.
Zom-This guy isn't needed to fight Nekron's army.He was only sent by CK to retrieve Marlo Chandler who has a fragment of Death inside her.In other words, CK can gain Death by absorbing a fragment of Death that will instantly kill all life in the Multiverse.
And if we use the info on Herc#1 of how many Gods and Monsters CK controls, its epic stompage.And Chaos King beats Nekron himself.If Nekron is death, its even a bigger reason for him to stay away from the Chaos King.Sure you can say only the white light of creation can defeat Nekron.That doesn't mean he's exempted from being absorbed by the Chaos King.Why do you think Death fled in the first place when Chaos King destroyed the afterlife?