Cheddar
Cheddar is in 19 recipes and behaves badly under heat compared to processed cheese: the older and sharper it is, the more likely it splits into oil and stringy protein. Mild or medium cheddar melts far more cleanly. What it gives in return is actual flavour — sharpness that stands up to a heavily seasoned patty, where American cheese would disappear. Several builds here use both, one slice of each, which is a reasonable compromise between melt and taste.
Often goes with
Recipes with cheddar

Dean’s Breakfast Burger from Supernatural

Cheeseburger Wellington

KFC Gravy Burger (Copycat)

KFC Dirty Louisiana Burger (Copycat)

Homemade Smash Burgers

Spicy Chicken Burger with Beer Cheese Sauce

Viral Bacon Spiral Burger

Copycat Red Robin Whiskey River BBQ Burger with Onion Straws

Burger Sliders
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McDonald's CBO (Copycat)

Onion Bomb Burger

Juicy Lucy Cheddar Burgers

Best Hamburger Ever

KFC Double Down (Copycat)

Cheesy Bacon Ranch Burger Sliders

KFC Tower Burger (Copycat)

Tofu Burgers

KFC Mac 'N Cheese Zinger (Copycat)

Easy Bacon, Onion, and Cheese-Stuffed Burgers