I think honey is pretty much all sugar, so would have fewer calories per gram than peanut butter. For best calorie to weight ratio, I think you would want something with a higher fat content.

I've looked at the ingredients/calorie information on most of the commercially available snacks (e.g. Power Bars) and they all seem pretty heavy on the carbohydrates; not suitable for a balanced diet over an extended period unless supplemented by something else. Of course, they're designed for quick energy boosts for athletes, I believe, not as emergency rations.