As far as I know you cannot get damage food from housekeepers, which automatically makes cooking >> housekeeper cooking, not to mention the food from housekeeprs isn't as good as crafted food. I'd go for cooking over a housekeeper.. make it another potion housekeeper, those pots you can't get anywhere else.
Ditto - although you can do both.. Just get a HK with 100 cooking, and you can still work crafting/potions up to 80 if you like.. That's good enough for all the potions except for Godspeed. Then use your other HKs for potions, and if you're missing any, you can use the cooking HK for more potions, or if you get all the potions you need from your first 3 HKs, you can use the cooking one for, well, cooking stuff.
The only potions I absolutely hate living without are Unbridled Enthusiasm & Lucky Target.. Others I *like* to have are Galloping Gale and Clear Thought, but I can live without them if I have to.
Depending on your character type & playstyle, of course, the potions you like may be different (for instance as a Mage, I have NO need for pungent Vileness - but for a tank it's essential)..
Of my 4 HKs, I only have 1 that will eventually reach 100 crafting.. the others are 100 in other things (cooking, magic buffs, and defense buffs).. but I'll eventually work them all up to 80 crafting as well "just in case" I need them.
Most important thing is to make sure you get HKs with 100 Affinity and 100 Charisma. If you have 80s for EITHER of those, pick a different HK.