In a true survival situation.....like an "end of the world" scenario. Maybe an asteroid hitting earth. Being alone is being dead. I prefer alone, but don't have any illusions. If you don't belong to a group, eventually another group will kill you, and take what you have. It's that simple. That's assuming you have a family to care for. Even if it were simply me...and I'm a skilled outdooorsman, who still sleeps on the ground often, and am completely comfortable in wild country, alone....I realize being alone in that situation, the odds would be stacked against me. Sooner, or later, you will run into a group, and at that point, you're probably toast. Even if you have valuable talents the group could use, you probably wouldn't get a chance to display them.
Jim