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Food and drink are described as boosting vitality regeneration for a few seconds, varying by food. I suspect that each piece of food heals the same amount of vitality, so faster food (lower number of seconds) is superior to food that boosts regeneration for longer times. Needs verification.
I got the superior hanged man's venom in a tomb near the town you meet Yennefer in Skelliege. There is a pair of old women outside who give you a quest to clear it. Around four lvl 20 wraiths and a lvl 26 or 27 nightwraith to kill. You will also recieve a relic steel sword I believe.
Food Potency seems to be the same across the board. Looks like Duration is the only thing that varies. I'll get Geralt sick off some Pots and check this out tonight to double check.