Necrons benefited from max sized units more than any other army (except maybe orks and daemons) in 8th, but I don't know if that is still true in 9th, as most armies are MSU based.
I assumed this is the same in 9th; though am not sure and am thinking of including some immortals or splitting the warriors into two groups.
This is also the reason why I am not using any LHD; even though they do more damage than Doomstalkers, I feel anything less than ample ablative wounds leaves them too vulnerable.
Also, I know that a C'tan is not a competitive choice, but I just think they're neat.
Dynasty Choice: Circumstance of Awakening: Relentlessly Expansionist, Dynastic Tradition: Masters of the Martial, Dynasty:
+ No Force Org Slot +
Bound Creation [2 PL, 40pts]
. . 2x Cryptothrall: 2x Scouring Eye, 2x Scythed Limbs
+ HQ +
Psychomancer [5 PL, 95pts]: Arkana: Hypermaterial Ablator, Relic: Gauntlet of the Conflagrator, Warlord, Warlord Trait (Codex 1): Enduring Will
+ Troops +
Necron Warriors [12 PL, 260pts]
. 20x Necron Warrior (Gauss Reaper): 20x Gauss Reaper
+ Elites +
Skorpekh Destroyers [5 PL, 105pts]: Skorpekh Destroyer (Reap-Blade)
. 2x Skorpekh Destroyer (Thresher): 2x Hyperphase Threshers
Transcendent C'tan [14 PL, 270pts]: Power of the C'tan: Antimatter Meteor, Power of the C'tan: Cosmic Fire, Random Fractured Personality
+ Fast Attack +
Canoptek Scarab Swarms [4 PL, 90pts]
. 6x Canoptek Scarab Swarm: 6x Feeder Mandibles
+ Heavy Support +
Canoptek Doomstalker [7 PL, 140pts]