Well, there's no doubt in 1985-9 the Amiga was a lot better than PC for any kind of arcade games... But the 386/486s and the Mode-X made perfect scrolling games possible on the PC as well. And by 93-94, a lot of PC arcade games had good scrolling, in addition to more colors than Amiga versions, no slowdowns and same module-based sound... And at the same time, any other games (3D, adventure) were a lot better on the PC (256 colors, more animations, voices,...).