Good fry sauce has more than mayo/ketchup. Usually a bit of mustard and relish. Some sriracha or other hot sauce adds kick. I like chopping up dill pickles to add to mine. Some cayenne and chili powder. Again, restaurant fry sauce is fake, real good fry sauce is made at home

I can agree to that. A lot of places overuse mayo in their sauces

If you want a good aioli i make one at work that is mayo, sriracha and maple syrup and its really good on burgers. Also bacon jam is a tasty savory/sweet sauce that goes good on burgers. Or chimichuri is good burger sauce

I think most restaurant fry sauce is disapointing. So mucb better to make it yourself. Are you looking for a mayo based sauce like a good aioli, or a non mayo/ketchup sauce for a burger?

Try fry sauce. Its like burger sauce but theres extra stuff in it. Utah delicacy, every family has their own variation