To follow 1happyman and give my journey over the last few years including some of the entry R2R DAC’s mentioned here that might help with your decision.
TL;DR: After 3 R2R DAC’s(at different points), a Chord 2Qute, and a DACless amp(Technics SU-GX70 which is so versatile), I have settled on the Gustard A26(Dual AK 4499EX chips) for now and am really enjoying it. It has what I was looking for in an R2R DAC and still has detail that I felt was missing from the R2R DAC’s.
I started out using the DAC’s in my PS Audio Sprout and Bluesound Node 2i. I then went to a Raspberry PI running Volumio/Roon with a custom R2R DAC. It’s the least expensive R2R that I have used and also my favorite. I then moved on to an OG Denfrips Ares and had that in my system for a year. I got curious and ended up with a Chord 2Qute. It was a tough choice between the Chord and the Denafrips as they both had their strengths and weakness depending on the type of music I was listening to. I kept the Chord in my system for a year and became curious again. I started looking for an OG Chord Hugo TT, but ended up with a Holo Audio Cyan 2. It’s a solid DAC but I just didn’t do it for me so I went looking and ended up with the Gustard A26 which to me has the a lot of the positive attributes of an R2R DAC combined with the positive attributes of an D/S DAC. I am happy with the sound and synergy with my current system. I still would like to put a Hugo TT in my system as I did like the Chord "sound" and would like to hear a higher level Chord DAC.
A few things that are great about the Gustard A26 is that: 1.It can take a direct ethernet connection and act as a renderer negating the need for a streamer. 2. It can also act as a NAA if you want to use HQPlayer.
I listen about 75% with headphones and 25% nearfield. The main parts of my current system are Sonore Optical Rendu, Gustard A26, LTA MZ3(preamp and headphone amp), Peachtree GaN 400(amp), and Neat Petite Classics(speaker).
I hope my journey and listening experience can help with your decision. Happy Listening!