I sort of consider dipping fries and fries with stuff on them to be two different but related species of meal, pretty much exactly like the difference between chips-and-salsa and nachos. Frychos.
As to preferences, for dipping, spicy ketchup (mix tomato ketchup 1-for-1 with siriacha or other hot sauce); for frychos, fucking everything! Load em up: guacamole, chilli, cheese, onions, peppers, bacon, mushrooms, gravy, salsa, mustard, marshmallows, spinkles, alright alright I’m getting carried away now, you get the idea!