I've had a few R2R DACs Schitt and Denafrips and a few Delta Sigma W4S and Lampizator. I found the R2R vs Delta Sigma was less important than cost for sound quality.
I preferred the more expensive W4s to the Schitt and the more expensive Lampizator GG to the Denafrips Terminator Plus.
For a DAC under $ 1000 the power supply and clock are likely to matter more than the conversion process. Garbage in is garbage out.
I also agree with @pennfootball71, try the Lampizator.