I think one thing that is usually overlooked in these discussions is the "feeling" part of it, for lack of a better term. Some things make you want to keep on eating, while others are satiating. Of course, if you're able to only eat one Snickers bar a day while the cupboard is full of them, then that's great! I know I can't, so I avoid them altogether.
Carb content (calories, actually) isn't important per se, what matters is the total consumed quantity, and usually calorie-dense foods have a tendency to incite overconsumption.