Raising Cane's sauce has a tangy, savory emphasis. It does have a hint of ketchup for sweetness, but Worcestershire sauce and black pepper seem to be the dominant flavors.
Chick-fil-A sauce has a thick mayo base and a tangy sharpness supplied by pepper, vinegar, and garlic. Where it diverges is the sweetness from honey mustard and barbecue sauce.
The basic components of Chick-fil-A sauce are tomato paste, corn syrup, hickory smoke flavor, egg yolk, and soybean oil, plus other seasonings and preservatives.
A rough approximation of Raising Cane's ingredients are mayo, lemon, ketchup, super savory Worcestershire sauce, garlic powder, and oodles of black cracked pepper.
The condiments are also served in unique containers. Raising Cane's uses translucent diner-style portion cups, while Chick-fil-A opts for prepackaged dipping tubs.