The 'best' audio driver is generally the one provided by the mfg of your motherboard if using a desktop PC, or the mfg of your laptop.
Audio drivers don't get many updates, so as long as the driver is a dedicated Win10 driver it shouldn't matter if it's old.
The driver provided by Realtek on their web site is a generic driver and is not always suitable, as Realtek point out on their download page.
Assuming the correct Realtek driver is installed and you have issues with the audio that cannot be rectified by the options
in the Realtek HD Audio Manager software, your outputs (if using external speakers), speakers, or the audio chip may be faulty.
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