According to this very rigorous test from Serious Eats, Burger King and McDonald's have equally good fries. 🤔
There's still something deep-seated and powerful about the McDonald's version that makes it the quintessential french fry. Like the way your mom's chocolate chip cookie should always be tops to your personal palate, fries from the Golden Arches probably belong on a special pedestal, in an unassailable category all their own. But in a totally objective, no-holds-barred, the-emperor's-not-wearing-any-clothes kind of way, I think Burger King's might actually taste better.