I think this game appeared around the same time as Red Baron, and always played a second fiddle to it?
PMIK: As usual for this era, the Amiga version looks so so so so so much better.
Nope. This game was released in 1990 (1991 for Amiga), and as was already common by then, it used 256-color VGA graphics with a better color palette compared to Amiga's 32-color (OCS) graphics.
PC version:
http://www.mobygames.com/game/dos/knights-of-the-sky/screenshots/gameShotId,139/
Amiga version:
http://www.mobygames.com/game/amiga/knights-of-the-sky/screenshots/gameShotId,449105/
Notice how the PC version has better looking sky and the colors overall are smoother, with gradient colors? Plus, the PC version probably ran more smoothly, being a 3D polygonal game and all.
IAmSinistar: I remember this one on the Amiga.
Obviously superior there, but the DOS version is welcome too. Thanks!
No no no, and still no! :)
Oh yeah, and the PC version supported analog flightsticks. I am pretty sure on Amiga you had to do with a digital on/off joystick in this game.
Flight and space combat simulations were one genre which were usually superior on PC (in the early 90s and so), for the reasons stated above (VGA graphics, faster polygonal graphics, and analog joystick support).
EDIT: I just tried both the GOG version I just bought, and the Amiga version on WinUAE emulator. Yep, overall the PC version is superior. The only thing where I'd say Amiga wins in that the engine sound is more convincing (I tried the PC version both with Adlib and Roland MT-32 sound support), but other than that, the PC version is the definite version with better and smoother graphics and better controls.