Rocio,
I'm a bit puzzled about the distinction you make between Natalie Cole and Christina Aguilera. Like you I also prefer to listen to Natalie Cole. Aguilera's voice to me sounds less 'polished', but I guess that's exactly how she wants to sound and thus it seems to me this is rather a matter of style/taste than one of technique. I don't think any of them can be said to use more than a bare minimum of technique borrowed from the bel canto tradition.
Cheers,
Wim
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