According to the World Health Organization
, it is much more likely that the greatest threat comes from what is on your plate rather than where in the restaurant your plate happens to be.
I know what you all are thinking; the WHO is so pro-gun that they probably skewed the results to make gun deaths seem less prevalent...
I sit far away from the door because I live in New England. This time of year it gets pretty cold and I don't like the draft every time someone comes through the door.
I like booths because they are more comfortable and I don't like being in the flow of traffic of other diners and servers.
I don't worry about cars coming through the side of the building, malicious food poisoning, or someone shooting the place up. These events have a disproportionate mental impact because their terribleness outweighs their improbability.
Besides, trying to predict the motivation and methods of a madman is futile. For all we know, the incident could begin with the villain shooting those he thinks most able to flee.