Just a couple of points, not all TVs send a digital signal via optical to your soundbar or AV receiver, at least not from all sources. I have an LG TV that does but my new Panasonic doesn't. If you have ARC, I would go with HDMI connections for sure. I know on my Sony TV with ARC when I turn on say my Blu Ray (also with ARC), my AV (also with ARC) receiver automatically goes to that input on my AV receiver, so it's convenient.
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