Leona Lewis
Christina has an amazing instrument, but I view Leona as a more skilled vocalist, she actually knows how to use her voice properly, whereas Christina evidently doesn't, hense her vocal decline
Leona sings in the same tone in the vast majority of her songs plus she is nobody's artist.
Christina can swith up her tone and perform any genre. She not only gives amazing album artwork but she co-writes her material and her Back to Basics tour was pop perfection. #xtinaFTW!!!!
