The decision to connect a soundbar using HDMI or optical largely depends on the soundbar's features and the user's requirements. If the soundbar supports advanced audio formats like Dolby Atmos or DTS:X, then HDMI (specifically with ARC or eARC) would be the better choice, as Optical doesn't have the bandwidth to support these formats. HDMI also offers the advantage of an Audio Return Channel (ARC), allowing the TV to send audio back to the soundbar, making the setup cleaner with fewer cables. On the other hand, if the soundbar and TV setup is straightforward without the need for advanced audio formats, optical can be a reliable and simple choice. It provides a clear, consistent audio signal and is immune to electromagnetic interference.