Rihanna isn't able to make a true artistic album. I think that's why Beyonce will always be ahead of her.
ANTI was suppose to be timeless and artistic but we have songs like "Pose", "Woo", "Yeah, I Said It",, and "Sex With Me".
Her mind is too messy to do an album with a cohesive theme that completely flows together. She'll always end up throwing 10 different things together and putting 5 different themes on an album. + you need to have some sort of creative control to be able to pull it off.