She's not lying though, Ariana's vocal range is 4 octaves and Christina's vocal range is 4 octaves. Both are undeniably impressive and rare within the pop music industry
Obviously Christina is superior, but she's just referring to vocal range!
Ariana cannot touch Xtina vocally. They're not even in the same planet.
Sure explains why The Heart Wants What It Wants is getting higher digital sales and streaming than Love Me Harder despite getting 1/5th the amount of promotion.
Now I can see the comparison. One has chart peaks in her favor, while the other has actual sales and indications of praise for her music in her favor. Let's keep it moving, Selegend.