I never played the arcade version at the...er...arcades. My first encounter with it was only recently, via MAME.
Maybe I'm missing out on what Silkworm was like to actually experience at the arcade, or maybe my view is simply tinted and tainted because I played (and loved) the Amiga version first. All I can say, however, is that I was quite disappointed when I finally booted up the arcade original in MAME. It just looked ugly in comparison to the Amiga version.