I think it hard to say for every singer has his advantages..

Ed sheeran and kodaline 

It should be Who is your favorite singer? Mine is Hikaru Utada she's a japanese singer who specializes in different genres of music

Her name is Dona Kely. She sings rap in a group.Ao Cubo.

Dona Kely is my favourite singer.

Britney Spears

I don't know her personality.

but I like her voice and song.