Why Admiral Holland could be the greater loss

Which was the greater loss, HMS Hood or Admiral Holland?

Probably Holland, because Hood was due for refit while skilled senior officers were in short supply.

The ship's emotional prominence differs from the operational scarcity of senior officers. Hood would soon leave service temporarily for reconstruction and therefore had limited immediate availability. Holland belonged to a small pool of experienced senior officers needed for wartime commands. Losing trained leadership can hurt a navy more persistently than losing a famous hull.