The FINER the grind — Expresso or better yet, Turkish grind — exposes more bean surface to hot water, and gives a far, far better flavor than the canned junk (Folger’s, Maxwell House etc) from the store shelves.
You CAN regrind those two canned coffees and get a ‘decent’ cup of coffee, in an emergency. Dunkin Donuts coffee is okay, as well, if you grind it yourself, to a Turkish Grind.
I drink Kona Hawaiian and Jamaican Blue Mountain, Turkish Grind, daily. using an unflavored Half & Half from the local convenience store, to soften the flavor.
Two of my super-secret sources:
https://www.coffeeam.com
&
https://www.coffeefool.com