I'm just impressed the first four answers were all different. I like Buffalo the most, but when I was younger, I remember plain honey being a sauce and that was pretty good. Do they still do that?
Sweet and Sour. Typically, my go to for chicken nuggets is honey mustard, but for Chicken McNuggets, SnS is just too good. And I often don't care much for other's sweet and sour sauces either, there's something about McDonald's and how it pairs with the McNugs.
It's McDonald's and nuggets, not the infantile Maccas and nuggies baby talk, and the correct choice is spicy buffalo. It was hot mustard but that's no longer available, at least where I am.