Commercially? The PRISM era hands down.
Katy did what she does best and sold generic single after single.
In terms of impact and longevity Unapologetic will be remembered the most.
Diamonds &
Stay are already shaping up to be classics, especially with Stay being the best selling ballad by a black female. Not to mention Rihanna won not one, but two icon awards during this era as well as a grammy for the album.
Being objective as possible,
Rihanna wins;
quality over quantity.
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