Whitney Houston will always be the Queen of Vocals to me. She had soul, power, and was an entertainer. She put on a show with her voice. Mariah, in my opinion, never sang with soul. She's a different type of singer as someone already mentioned. They're both great in their own ways and I'm glad Ariana looks up to both of them. She is a well trained vocalist already but she can learn alot from them, Whitney especially.