So one of my regular reads is a site called kottke.org. Not sure where I originally found out about this site but I recommend it. There is a constant wave of new content and it spans the gamut. Today, the site had a small post comparing In-N-Out burgers to Shack Burgers. I have never had a Shack burger but I had the opportunity to go to an In-N-Out in California a while back. It was a damn good burger. I bought a t-shirt. We have photos of us in front of it. It was good.
Somehow, in this vote, Shack Burgers win. Although I just looked and the Shake Shack is not a chain. This distinction is not quite clear in kottke's review. However, if I am ever in Madison Square Park, I know where I will get lunch. If you ever see an In-N-Out burger, I recommend you do the same.