-What are the main technical differences ?
68030 vs 68060 (no real-life difference)
32 vs 256 MByte memory
True Amiga vs New 3D graphics, audio channels etc.. (but unsupported)
PCI-slots on NatAmi.
-Do they offer the same functionality ?
NatAmi is intended to be a "new Amiga" rather than a compatible one.
-Are they meant to cover the same area of use ?
NatAmi is intended to have new functionality not found in real Amigas.
-A big price difference ?
"
The "light" card without SVHS/composite is 200Euro."
No price for NatAmi, but proberbly higher.
-Production difference ? (Handmade / Machine made)
Fpgaarcade has the PCB factory made and the FPGA machine soldered. The rest of the components are hand soldered.
-What can A do that B does not ?
You can't under any circumstance tinker with NatAmi's HDL source code. Should it be released it's still locked to a specific FPGA vendor.
With FPGA Arcade ASFAIK, the HDL sources will be released for tinkering, hacking and feature proofing.
(I can be wromg
)