Delta-sigma DACs, while they can have very impressive technical specs, still give an approximation of the original signal. In medical and scientific fields, delta-sigma DACs aren't used because they give "approximate" results. Even if the approximation is close, that still isn't good enough.
The drawback of R2R (AKA multibit) DACs is cost -- they are more expensive to make, which make the delta-sigma DACs very attractive for consumer products.
Another variable factor in design for both types of DACs are the filters used. Delta-sigma DACs generate a lot more high frequency noise that needs to be filtered out. While the end result for a DS DAC can be very, very quiet, it took a very aggressive filter to accomplish that.
Finally, as with any audio electronic component, there are the issues of power supply and analog amplification states. These can be better or worse. All of these factors combine to give a DAC it's "sound" so you will still need to listen to the options available to you in your price range and make your own decision. (Full disclosure, I have used several DACs and my preference is my Schiit Bifrost.)
