Tabasco is my favorite of the Louisiana-style hot sauces. I like the vinegary, fermented flavor mostly on potatoes, specifically hash browns and french fries.
Yucateca, especially the green, is my favorite Mexican sauce, but I have to go out of my way to get it.
I like siracha for eggs.
I like “Grumpy Aunt” child crisp oil to liven up rice or stir-fry vegetables or noodles.