Considering essentially every prospect-ranking service has Swanson ahead of Albies, I think there is some doubt.
I don't really care who people have ahead of the other or which one ultimately is better because they're both going to be really good and that's awesome for the Braves. But to say Albies is the best prospect in baseball, to me, is a bit of an overstatement, and it just comes down to ultimate ceiling.
Albies has about as high a floor for a 19-year-old kid as I've ever seen...but I don't think his ceiling is as high as some other prospects, including possibly Swanson. If everything goes right, he's going to hit .320+ with a good OBP, really good defense, and really good baserunning. That is a great baseball player. But I think if everything goes right for Swanson, he's going to hit .320+ with a good OBP, really good defense, really good baserunning...and some power. That's the only real difference I see, and it may not ultimately matter.