Gaga.
When my friends talk about Rihanna, they always talk about her in a sexual way. Nothing more.
Whereas my friends have actually joked about Gaga, but at the same time they think she is the most successful pop star since Madonna

And they respect her for that.
And they acknowledge her talent and looks. One of my friend who is an artist (painter) he actually listened to C2C more than I did

He likes Jazz music.