Nope, no Amiga bias. I love the amiga, but am more than willing (heck Ive said it a few times) that amiga games typically dont age as well as a lot of other systems. Im an Amiga fan, but its definately not for the vast majority of games from it heyday.
What I judged my opinion on was running them simultaneously (both on original hardware) and judging for myself.
Theyre both a little different from the arcade parent in different ways, but overall I prefer the Amiga version.
To each his own, but to question people finding Amiga version playable is, well, I'll say, "interesting". It's not exactly rocket science, nor a detriment to press up/down plus fire instead of a different button.