Five Guys is greasy, lard coated shit in a bag.
In-N-Out is fucking heavenly. Nothing beats a double double with grilled onions.
your description of Five Guys is perfect for In N Out fries.
I've never had Five Guys, so I can't comment. But I do know that In N Out fries are some of the worst in all of fast food. That's kind of important, in my book.
While it's not a chain, many cities have their own version of a place like Char Grill (Raleigh, NC). By far, these are the best damn burgers (Fucking STEAK burgers!!) in the fast food world.
yes, hard to compare them to the In N Out and McDonald's class of restaurants, but if you have a walk-up char-grilling burger joint in your city, it tends to be the absolute best.