TSA writes: “Terminators and Genestealers are not far off being each others worst nightmares. For the Space Marines, theyre decked out in armour as thick as a tank, bristling with heavy weaponry and comically large melee weapons, making them ideal for setting foot on and battling xeno threats, but less good for fighting nimble, fast moving targets. Enter the Genestealer; theyre fast and theyre nimble, but they dont have any ranged weaponry or armour, instead relying on their weight of numbers, speed and agility to get up close and claw at things until theyre dead.”
Source: N4G PC Space Hulk: Tactics Builds On The Brutality Of The Board Game (TSA)