I use a few songs from Gaga's albums, not all of them, I like about 4 song from The Fame, I LOVE The Fame Monster tho (that's perfection), Born This Way was an ok album.
Now Ke$ha, I love Animal, Cannibal, AND Warrior, so I'd say Ke$ha, I use 90% of her songs.
The Fame >>>>>>>>>>>>> Animal The Fame Monster >>>>>>>>>>>>> Cannibal The Remix >>>>>>>>>>>>> I Am the Dance Commander + I Command You to Dance Born This Way >>>>>>>>>>>>> Warrior
I love all these albums, but unfortunately I think Gaga wins in every category except for the last one. I think I liked Warrior more than Born This Way, though. It was tough, though, because all these albums are amazing.