My Brother and I play weekly and I just can't seem to win. I'm playing Nids and He's on Dark Angels. Does his list have too much Anti-tank or do I just need to get better?

Dark Angels List:

1x Azrael 1x Apothecary Biologis Fire Discipline 1x Lieutenant with Combi-weapon 1x Techmarine Artificer Armour 5x Intercessor Squad 5x Deathwing Knights with Maces 5x Deathwing Knights with Maces 5x Devastator Squad with Lascannon 5x Devastator Squad with Lascannon 6x Eradicator Squad lead by Apothecary Biologis 6x Inner Circle Companions lead by Azrael 5x Scout Squad 1x Gladiator Lancer with Laser Destroyer 1x Redemptor Dreadnought with Macro Plasma Incinerator

Tyranids List:

1x Old One Eye 1× Hive Tyrant with Adaptive Biology 1x Neurotyrant 10x Gargoyles 20x Termagants 1x Biovores 1x Lictor 1x Lictor 1x Neurolictor 3x Zoanthropes lead by Neurotyrant 1x Exocrine 1x Maleceptor 1x Norn Emissary 1x Screamer-killer 1x Tyrannofex with Rupture Cannon

Yall's insight would be appreciated.