Ah yes the coast to coast comparison between In-N-Out Burger and Shake Shack.
Having Californian allegiances, I have to go with In-N-Out but not by much. One win Shake Shack owns is a pretty decent beer selection. The ShackMeister Ale is actually a pretty legit amber brewski that pairs well with the burgers and fries. I appreciate the fresh lettuce and tomato on the namesake burger but the patty, while legit in its own right, is slightly less juicy than its Californian comparison. Still an overall decent burger though. Can't say the same about the fries unfortunately. This is where In-N-Out's fresh cut fries win.
The service is quick and efficient and you'll be in and out in a relative jiffy. It could add up once you add lots of extras which can get you more elsewhere in Vegas but otherwise an all up decent fast-casual meal.