While both oatmeal stouts and porters are dark beers with rich, malty flavors, there are some differences that set them apart. Oatmeal stouts contain a portion of oatmeal in their grain bill, which contributes to their signature smooth, velvety texture, and full body. English porters, on the other hand, are brewed without oatmeal and typically have a lighter body and mouthfeel. Additionally, porters tend to have a more pronounced hop presence, whereas oatmeal stouts usually have lower levels of hop bitterness.