What is your favorite dipping sauce for artichokes?

Dukes Mayo,plain and simple.

Chermoula is really good with artichokes. April Bloomfield's lemon-caper dressing is also great: https://food52.com/recipes/16940-april-bloomfield-s-lemon-caper-dressing
Other tart, herby sauces are good too, like Green Goddess dressing (I like the recipe from Gwyneth Paltrow, although I find the source a little embarrassing).

Melted salted butter, or mayonnaise.

With a hot steamed artichoke, melted butter with a squeeze of lemon (sometimes a dash of Tabasco too.) If the artichoke is served chilled, a good mustardy vinaigrette.

Fresh lemon juice, nothing else.

I like plain mayo, plain melted butter, or plain lemon, squeezed over.

I like them Roman style---although they are not for dipping. You trim all the tough parts off down to the tender leaves, clean out the choke peel the stem and eat almost the whole thing with olive oil, mint, parsley and lemon.

Melted butter mixed with lemon juice.

I like a lemon garlic aioli with a dash of cayenne(I know..you've been there, done that), curried mayo (love) and bagna cauda.