...I do not mention Amithlon, because it's discontinued.
But what are the differences, advantages/disadvantages?
Anubis is supposed to become a Linux with Amiga look & feel, and an integrated emulator. There is xamiga, which already is a Linux with integrated emulator (e-uae). And there is icaros as a stand-alone Amiga replacement. But in fact, it is a kind of new OS with a strong Amiga look & feel, which can run ported software, but old software also only via an emulator.
So what does make sence to use? Xamiga is a succesor of Amithlon (kind of). But how good is it? You hear nothing about it in any forum... Icaros does not work on my PC (IBM Thinkpad T23), so I can't give it a try. And last but not least Anubis. Currently it is only vapourware. But will it be more than any other Linux-distribution with an Amiga-emulator?