Soldier,
Undefined,
19 years ago
This is not an excuse, but a semi-theory-thing. In Alien, there was an actor in the alien suit. That suit probably weighed alot, with the head, tail, and other stuff, and the suit was probably also hot inside. So the actor couldn't build up a sweet, and running at nromal alien speed with already that heat and weight, would probably cause him to overheat. Maybe aliens also like to sort of "play with their anarmed food" judging by how cruelly the Giger took out its prey. But in Alien vs. Predator, the aliens were animatronics, so they didn't have to worry about weight and overheating. So maybe the Giger Alien was actually normal speed, but for the sake of the actor, had to be slow, or just chose to be slow. The only thing that has really changed his the design and the paddle tail of the aliens in Alien Resurrection and Alien vs. Predator. Also, the Grid Alien used the force of its acid blood on the Celtic, and snuck up an Chopper when he was least expecting it. Their is no way to sneak up on an alien, and an alien can't be hurt by its own, or another's acid blood. The Grid also ran on all fours, while the Giger stood upright.
Also, it would depend on what the area they fought in was like. It could be anything, from a maze of epic proportions, to a simple circular arena. I change my mind. It could be more equally matched, except the Giger Alien is alot bigger, and the Grid Alien has a longer tail, with a bigger blade. Maybe it's all a match of luck. I'll call it a tie.