Britney can go. She's the worst singer, performer, songwriter, she gets the least critical acclaim, she gets the least GRAMMYs, she's too lazy and embarassing to properly promote her work, her latest album is worse and worse-performing than the others' latest, and currently she is the most irrelevant out of these three.
She used to be fine, though.
Yet with all those lies you stated she made more impact that they other 2 so
Adele ▲ Rihanna ▲ Loreen
Lana Del Rey ▲ Nelly Furtado ▲ Katy Perry