AmigaOS 2 (I think this was the first 32-bit amiga OS) was, and this is putting it kindly, primitive compared to System 7.
Besides, in the early 90s when Amiga was dying Apple was also dying. They only survived because of extremely high-end desktop publishing and educational users buying IIfx's, Quadra 950s, and PowerMac 8100s, the fact that Apple moved to PowerPC (two months before this article was published) while Amiga was releasing the 4000T with a 68040, and their extremely desirable laptops.
People like to dismiss Apple but there were many years in the 80s, 90s, and 2000s when Macintoshes were the absolutely, irrefutably, and unquestionably fastest non-UNIX workstation personal computers you could buy at any price. And then they became UNIX workstations.