Here is a Turtles Coin-op comparison, the Amiga and ST versions are at the end of the video:
[ Show youtube player ]
Scrolling is smoother on the Amiga, but according to this video, ST version has music and Amiga version doesn't.
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Also the differences in Darius+ are interesting:
Atari ST
[ Show youtube player ]
Amiga:
[ Show youtube player ]
On the Amiga also the second background layer scrolls, while in the ST version it does not. And also in the Amiga version a few colors in the palette are changed at certain points, giving the enemies in each attack wave slightly different colors. Although I'm not sure if the ST version does this palette swapping too. But to me it seems that they seriously tried to make the Amiga version better.
