Just piling on, Guiness more or less defines the style "dry stout", it is commonly available, suitable for session drinking and varies a bit from country to country.

As beers go Guiness is the easiest to get "good" beer in North American lager country.

Partial to export stouts myself, a different subset of stouts in general. My favorite that I know of so far is Lion Stout from Sri Lanka, the best I can get locally is Sheaf Stout from Australia.