In theory, the Realtek Digital Output is already very good. Because the signal is digital, it isn’t susceptible to electrical noise from your PC’s power supply (no buzzing, hissing, or static). You are sending a pure signal to your receiver or DAC.
: If you are using standard 3.5mm computer speakers or headphones, you should keep the "Speakers" (Analog) option as your default. These devices cannot decode the raw digital signal from the S/PDIF port. realtek digital output better
Honesty is important. In three scenarios, analog or other outputs win: In theory, the Realtek Digital Output is already very good
The answer depends entirely on your hardware chain—specifically where your sound is being converted from data into the airwaves you hear. What is Realtek Digital Output? : If you are using standard 3
Realtek Digital Output is only "better" if you own the specific digital hardware to support it.