Barbeque sauce is probably the best condiment all-around. There are condiments I like more but I feel like BBQ goes with more stuff. I don’t eat much ketchup or mustard.
Ketchup or should I say Tomato Sauce. I'm Australian so I can't imagine what you could put mustard on other than a hot dog or a cheeseburger. Please enlighten me.
If I had to pick just one, definitely ketchup. I only like mustard when it’s mixed with ketchup on a burger, unless it’s honey mustard than I like that better than ketchup for dipping.