The Energon Pub

okay so the deal is we have a hive of xenomorphs made by face huggers impregnating the 'bugs' from starship troopers, against the colonial marines and mobile infantry from the alien and starship troopers films....which side is victorious, who knows, 1 thing is for certain, the casualty list will be astronomical.

Xenomorphs - until the soldiers just decide to nuke the infected site

If it's not the MI from the book, the Super bugs win this.

Now, if we're talking the REAL MI complete with powersuits...

I really don't think that the bugs would allow the xenomorphs to parasitise them. They are too strong and numerous. I think that the xenomorphs would all be killed by the bugs, although there will be heavy casualties on both sides. A few xenomorphs might survive as eggs, hidden underground and/or away from the hive. Anyway, it would be a fight between surviving bugs and the human invaders. The humans would win with nukes, other bombs and hard fighting.

Actually, if humans have faster-than-light travel then they also have dimensional manipulation technology. They don't have to kill the bugs conventionally. They can shift them to another dimension where they would die quickly or slowly and not hurt anyone.

Humans win, whatever the case.