Calories, since you're trying to lose weight, but it's sort of an incomplete question.
Fat is sometimes worth avoiding for a few reasons. It is by far the most calorie-dense macronutrient, at 9 calories per gram compared to 4 for both carbohydrate and protein. Some fats (saturated, trans fats) may be unhealthy. And high fat is a characteristic of most of the foods that help get most of us in trouble (french fries, for instance, or fast food burgers, or cupcakes).
But there are also clear exceptions. For instance, a certain percentage of fat in your diet is necessary. Some types of fat (like those found in wild salmon, or avocado, or flax seeds) are likely very healthy. And not stinting on fat too much can go a long way, at least in my experience, towards composing meals that keep you full for a while.
So as with many things, the devil's in the details.
Your specific question seems to be one of two processed food items, one of which is low or zero fat and the other of which is "regular". In processed foods, when fat is taken out, it is often replaced with just as many calories of extra sugar and other ingredients -- hence what you're seeing with the calories. In this case (even if the calories had been slightly the other way around) avoiding the fat is rarely going to be the best choice: the added ingredients are probably worse for you than the fat would be.
A few foods (mostly dairy and meat products in my experience) do manage to remove some or all fat without adding anything else (think of good old fashioned skim milk and it's brethren), and in those cases I'd think it would be mostly down to personally choice as to how you want to spend your calories and what types of fats you'd like to have the most of in your diet.
Height 5'8 1/2"
5K 4/21/11: 31:55
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