Although they are usually interchangeable in recipes I do recommend using old - fashioned rolled oats in this recipe as I prefer their thicker texture and superior flavor. (joyofbaking.com)
But I would definitely use the two different types of oats in this recipe. (crumbtopbaking.com)
They're awesome as a hot breakfast option and work great as a sub for oats in recipes too! (eatingbirdfood.com)