What ingredient do you insist on, even though it costs more?

What’s the brand, ingredient, seasoning do you insist on even though it costs more? For us, lately we’ve discovered serious differences in brands of flour (King Arthur quality so consistent). I like to benefit from the experience of others, what is your “can’t miss, do not substitute, worth every penny” gotta have it item? EDIT: You all are incredible, keep em coming! Saving ALL your best things. I appreciate this so much.