Dunno, subjective. Britney Spears can't really sing can she?
I get that its a talent contest, but being able to shout your lyrics out at 50 decibels does not a good singer make (Alex).
No Britney can't, and she's a crap example of a talented singer.... as she isn't one.
Alex is vocally superior to Diana, pure and simple.
Diana had a quirky uniqueness, but after a few times it lost it's edge and just got annoying. Plus she has a smackable face