Wait...what? I always thought that PBR was Pabst cheap beer. They make something even worse? Like, Narraganset bad?
What is "Black Label" (never heard of such a beer)? And, Guinness is overrated, in my opinion.
There are "better" beers than Guinness, in a Pepsi Challenge sort of way. But there are no better beers. It's the finest session beer in the world; it's also about the best hangover cure there is. (Rinse and repeat.) It's low in both calories and alcohol. I love the big modern IPAs, but Guinness is like a mother's cool hand on the forehead.
It's taste, so it is subjective. However, I would take a Boddington's or a Beamish over a Guinness, were I to reach for a stout. I'm not too concerned with calories or ABV, so the fact that Guinness is low in both is of no consequence to me.