Another point to consider is: what will you be using by way of control app?
The Vega G2 is a superb streamer dac, but you don;t get the Auralic Lightning DS app with it (for that you need to add the Aries G2). You can use the Vega G2 as a Roon endpoint (I use my Vega G1 in that way), which is what I went with.
With Aurender, you are captive to the Aurender Conductor app, which is very good but you are still captive
With Lumin, you have choices: you can use the (nice) Lumin App or you may want to use Roon (e.g. when your music is on a NAS or NAS/NUC combo).
Listening to all 3 sources will be a challenge as few dealers carry all 3.
Perhaps decide how you want to manage your music (Aurender App, Lumin app, Roon, ...) and then try to listen to the player which accommodates that app?