As a former owner of the Aries + Vega 1 who upgraded to the Aries + Vega 2, I'd say both ranges are excellent products; however the 2 range benefits most from utilizing the Lightning Link to couple the two components.
I found that listening to the Aries + Vega 2 via my Transparent Reference USB the difference vs. the 1s was slight, but consistently noticeable (blacker backgrounds / less noise) but moving to the Audioquest Diamond HDMI as the Lightning Link cable took the 2s to another level. I have not listened to the 2.1 range.