Beyonce gets great reviews at the time of release, but I don't know how well her albums age. Lemonade didn't age well for me.
Beychella may end up being her magnum opus, and that's largely because it is performance-based.
I love her, but she doesn't have classic songs in the same way Vision of Love or We Belong Together are heartfelt classics. Even Fantasy or All I Want for Christmas are lighthearted classics. The only Bey song on that caliber is... Single Ladies? Crazy in Love?
Maybe because the industry is different and Bey has chosen to be a visual album artist known for "projects" instead of singles. Whereas Mariah's #1's alone make a great album because she has classic singles. On top of better albums than Bey.
Now, performing is Bey all the way.