Personally, I care more about the volume of ice cream I eat than the mass. I don't want to pay more for more calories when diminishing marginal utility is already in effect.
Always helps to check the unit price by weight that you can usually find on grocery store price tags (often written on a red/orange background but sometimes just in small print off to the side).
The volume of 2 containers can be the same, and checkout price can be the same, but if one is listed as $0.15/oz and the other is $0.20/oz, the cheaper one has more in it.
I looked into making my own ice cream once and had to realize, that practically any store bought ice cream must contain at least some, because my homemade ice cream immediately melted and was impossible to keep im a freezer…