The Natami won't run AmigaOS 4 any time soon because the main processor is an m68k, not PowerPC. Also, I don't think Natamis are for sale yet.
But if you're Ok with running AmigaOS 3.x and not 4, then my guess is that the Natami would run circles around other systems which emulate the Amiga chipset because they've reimplemented AGA and the original chipset, but in a highly modernized way (128 megs of ChipRAM, anyone?)
Personally I think the amount of hardware which AmigaOS supports is too small. I prefer what the MorphOS people did - porting the OS to run on PowerMac hardware opened up possibilities for many more people. I have a PowerPC Mac mini which is wonderfully fast, tiny, and works well with modern peripherals, and if I had the option to run AmigaOS on it, I'd definitely do it.
But if you're Ok with running AmigaOS 3.x and not 4, then my guess is that the Natami would run circles around other systems which emulate the Amiga chipset because they've reimplemented AGA and the original chipset, but in a highly modernized way (128 megs of ChipRAM, anyone?)
Personally I think the amount of hardware which AmigaOS supports is too small. I prefer what the MorphOS people did - porting the OS to run on PowerMac hardware opened up possibilities for many more people. I have a PowerPC Mac mini which is wonderfully fast, tiny, and works well with modern peripherals, and if I had the option to run AmigaOS on it, I'd definitely do it.