So this afternoon, after getting up from an un-nap (laying on the couch WANTING to nap, but Norm kept coming up and poking me in the face, grrrr), I set to my project of deciding which type of dulce de leche we liked better. I rolled out the cookie dough, baked the cookies, and then set to our taste test. I cut several cookies in half, on the left side using the cow's milk dulce de leche, and the right side using the goat's milk type. While both were excellent, we all agreed that we liked the cow's milk type better.
It had a richer, smoother, caramel-y flavor, while the goat's milk dulce de leche was a much stronger, cooked milk flavor. I'm thinking we'll save the goat's milk type for over ice cream or with apples, and I'll use the cow's milk type for the rest of the cookies, and will stick with that in the future. Plus, it is the same cost as a can of sweetened condensed milk, with out the work (or fear of destroying the kitchen).