It's not even close....if you're looking for a true California experience, the ONLY option is In-n-Out. I grew up in Southern California and I hadn't even heard of The Habit until a few years ago and I might be wrong but isn't Shake Shack a New York burger place?! Trust me my man, if you're coming to California and you want to do it right, get yourself a Double-Double burger, fries "Animal Style" (not on the menu but they serve them with grilled onions, secret sauce and cheese) and a strawberry milkshake. Before Anthony Bourdain died (RIP Tony) he said the FIRST thing he does soon as he lands in the state of California is head straight to an In-n-Out! Preach Tony.