To me, the Amiga was that great system that existed back in the late 1980s, that amazed everyone and provided us with hours of enjoyment (and had the chance to take over the world!)...
It is (was?) the custom hardware, 68K CPUs and OS3.x...
The new amiga-like systems are interesting hobby projects, but don't represent the spirit of Amiga or what it represented in its day...
