5 Guys. In & Out is definitely good, but the burgers aren't as big or filling as the ones from 5 Guys, plus the 5 Guys' fries are worth it by themselves. The In & Out fries are just typical fries. I think In N Out is plenty filling, considering you can get a double double, 3 x 3, or 4 x 4 depending on how hungry you are. I usually just get a double double, but have gotten a 3 x 3 when I'm especially hungry.