Title says it all. Here are the rules. And yes, I'm expecting this to be one of the shortest lists on DP
1. Game must be available for both St AND Amiga. A title won't win by default just because the Amiga doesn't have it.
2. Both ports must have been released within 3 years of each other.
3. Game must have that "holy crap! those amiga programmers were sleeping at the wheel" quality.
4. The actual game must actually be a good game to start with.
5. Game must be significantly better on the ST than the Amiga. For example: Zork