Personally I favor resistor ladder DACs for greater naturalness, I listen to lots of live acoustic music and I prefer as close an experience to that as possible. That’s why my 3 DACs are Yggdrasil, Onyx, and Soekris dac1541. For delta-sigma DACs, the RME ADI 2 has got a lot of positive feedback for a broad range of reviewers and measurers, but I haven’t listened to it myself.
Ambre is also a Pi-based system, except that it includes a good linear power supply and a separate board (like a HAT) but optically coupled (thus no electrical noise bleed-through) driving digital audio outputs. See this review for a lot more detail. https://www.criticalsound.co.nz/assets/Uploads/Alpha-Audio-Ambre-review2.pdf