I don't use Roon so RAAT is of no interest, this is a proprietary streaming format I believe.

Personally I would start with the AN One and see whether you think you need to change.

I think the AN2.1 is superb. Mine was breathed upon by Deco Audio and so is festooned with more Blackgates.

I preferred my AN to: Border patrol DAC (Great little box); Schitt Yggy; Lampizator 5; and even the AN 4.1 in my then system, going to do a round two if the world keeps turning!

M