If your primary concern is user Interface, Roon is hard to beat. In my view, Aurender’s conductor would be next, followed by BluOS and LDS. I auditioned Lumin before buying the Auralic and would put Lumin’s app as similar to LDS.
However, if your concern is sound quality, I found LDS to be significantly better than Roon over the same device. My speculation is that the software better utilizes the buffers built into the hardware. Comparing the same streams across the software, (no conversions), it was pretty easy to hear the superiority of LDS over Roon.
I didn’t make the same comparison of BluOS vs Roon because the Node 2 isn’t a higher performance unit and I didn’t think it worth making the comparison.
I’ve had some issues with stability on all of the units but Aurender’s conductor seems best in this regard. it’s the most stable of the bunch.
Best,