I own a Shadow so kind of biased but both are great games. STTNG is pretty awesome when it is working right and setup well. Shadow gameplay is tough but very rewarding when you have a good game. I would say it comes down to theme. I prefer Shadow mostly because I love the ramp diverters. STTNG gets frustrating with the wide open outlanes and cannons that block your view. The obvious answer is get both. When STTNG breaks down you can play Shadow. When Shadow makes you want to punch a wall, play STTNG.