I'm not sure the article is correct. It's common for people to say Grade B has more flavor. But is more flavor better flavor? I usually like very strong flavors, like Double IPAs, but does that mean IPAs are better than more subtly flavored Belgian Ales? I've been under the impression that Grade B has more flavor, but not better flavor. That Grade A has a less over-powering, cleaner flavor.
I haven't done a taste test, but it would be fun to line up shot glasses of different Grade A and B to test. Mmm, like beer tasting but with maple syrup. Other than the flavor thing, the article was very interesting.