HDMI ARC or Optical out ?

First , thank you to all who have responded !
I kind of thought that it would boil down to " try-and-see ."
It was worth a shot . I do have a nice DH Labs cable but not a HDMI
cable .
Marching on .

Be Safe 

David ;
  Thank you .

There really is not a discernable difference in the sound quality between the optical audio out or the HDMI/ARC .
 But... with the HDMI/ARC connection , I have retained the volume/mute functions on my Roku remote control . These functions were lost when using the optical out function .

Thank you to all of you for your help .
Be Safe