The 'Aliens vs. Predator' series spawned several novelizations, but the ones focusing purely on raw survival are rare. Most get tangled in corporate conspiracy or ancient lore. For pure, unrelenting survival battles, you need the original 1999 'Aliens versus Predator: Prey' by Steve Perry. It's stripped down to a jungle planet, a crashed colony ship, and the desperate humans caught between. The Predator hunts Aliens, sure, but the human perspective is just trying to live through the next hour, using wits and scavenged gear.
It feels like a horror survival game in book form—tense, claustrophobic, and brutally direct. The sequels, like 'Hunter's Planet' and 'War', expand the scope but lose that intimate fight-for-every-breath feeling. So if you want the essence of a survival battle, start with 'Prey'. The prose is functional, but the pacing never lets up, which is exactly what you'd want from a premise like that.