Really depends on what I am eating - I have far too many different condiments.
I like Piri Piri hot sauce for many things.
I usually mix Siracha and Dukes mayo for several things - especially French fries.
I get a German curry ketchup for many things - like brats.
For hotdogs I prefer a spicy German mustard or a whole grain mustard (or a mix of both)
"Irish Style" Curry sauce is also very good for French fries - you used to have to buy it in a packet and heat water and mix it yourself and it was Ok but not the same as what you get at a chip shop - but now they have a premade in a squirt bottle and its really good.
And of course I have numerous hot sauces ranging from tabasco to habanero and ghost pepper.