Both games play relatively the same. The Raptor Pit in the PREM is worlds better than on the Pro. The T-rex head on the Prem is still cool even after several hundred plays. Though it doesn't change gameplay experience much, it really adds to the atmosphere and immersion that the Pro just doesn't do. Hook a subwoofer to the game to get a deep growling roar, and you've got a pretty cool dino experience.