Shucked Oyster

The buff tier here is the weak one, and by the time you are cracking oysters open you can almost certainly cook something that lands you in Plenty Satisfied instead. That is a real gap in regeneration and stat bonuses, not a rounding difference, so most of the time the meat is vendor fodder and nothing else.

The exception is a fresh world with no kitchen yet. In the first hour any food buff beats none, and oysters are easy to gather along the ocean floor while you are down there for other reasons. Keep two or three, sell the rest.