@gabriel123,
I own the Bricasti M21 DAC. My DAC has a 24-bit delta sigma DAC, a 20-bit ladder DAC and true 1 bit DSD for DSD content. The front panel contains the settings to select what option you want.
I switched back and forth between delta sigma and the R2R DAC many times. After several weeks, I decided the R2R DAC setting sounds better. HOWEVER, I have friends that prefer the delta sigma setting. There is no right or wrong answer.
R2R DACs and Delta-Sigma DACs differ significantly in design and performance. R2R DACs use a resistor ladder network, offering simplicity and excellent linearity. Delta-Sigma DACs employ complex algorithms with oversampling and noise shaping, which can introduce nonlinearities. Obviously, it is more complicated than this.
R2R DACs are known for their natural, musical sound, preferred by audiophiles. Delta-Sigma DACs are precise but sometimes perceived as less organic. The MORE IMPORTANT thing is how does it sound with your equipment, your environment, your room and your ears.
Everyone one is different so the only way you can decide is to listen to both versions and pick the one that sounds the best in your system and your room. I suggest you forget the technology and DECIDE what version sounds the best to you.