Read veeery carefully.
The x86 will not run OS4.1. This is the difference. This is why the PPC systems exist, whether or not they're "Amigas," they run AmigaOS. Obviously, if you don't want to run OS4.1, you don't buy one of the overpriced PPC systems.
Maybe not today, tomorrow you never know. I know, with PPC sinking fast below the surface, not too many people will put the time and effort into a PPC emulator or improve the one that is out in the wild already. However, last I heard, doesn't MOS have a OS4 emulator?