Perhaps Beyonce. If you want bops, then look at her early catalogue. If you want introspective and cohesive material, look at her recent catalogue. There's a lot of variety.
i love both but Imma go with the one who has a team of 5 writers/producers rather than 100. Bey is just a little bit too trendy whereas Gaga only focuses on the art. Either way, they are my 2 favorite girls in the game.