Saying:
a) The only way A1 is related to Amiga is the *NAME*, and as such
b) the best way to go is WinUAE.
you're not giving decent information about the subject as there's more to A1 then *NAME*.
I don't want to get further into what Amiga is or isn't, everyone is entitled to his/her opinion about it, but get things straight when vocalizing that the only thing they share in common is the *NAME*.
I dont really understand what you mean. Os4 is based on the original AmigaOs sources thats true. But the A1 is in no way based on the original Amiga Hardware, just like the pegasos, or apple mainboards, or x86 mainboards. Its floppy controller cant even read amiga disks. The only connection to classic amigas is that it runs AmigaOS and that its called "amiga".
I am seeing things realisticly and Im not saying that the A1 is the wrong way to go and there should be a new custom amiga (which woul be very cool but sadly is impossible to do), but after all the Amiga One is just a standard atx ppc mainboard (which is nothing bad though).