Heard no real difference between my RME ADI-2 Pro, which I tried to "upgrade" to T+A 200 DAC + PreAmp. Both are DAC+preamp, which is necessary for me. People’s mileage may vary. My speakers in question are Dynaudio Focus 20 (active), and the source is always digital - Limetree Lindemann Bridge with LPS.
RME is an intensely resolving and "rich" DAC. It doesn't add or subtract anything.