Which audio output to use?

i have a odroid n2 and i am not sure which audio output device i should use.
i have 3 different hdmi output options: hdmi pcm, hdmi multi ch pcm and only hdmi.
i have a marantz sr 7011 and use atmos, auro3d etc.

HDMI Multi ch PCM. Then enable passthrough for all relevant audio codecs below.

what is the difference between those 3?

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