I prefer
Gracia. However, I like
Graciela the best. I would use
Graciela and perhaps call her
Gracia as a nn. I would not use
Gracia as a full name.
I do not care for
Vincente but that is only because I am partial to
Vincent. I would use
Vincent. I think it is a sexy/masculine name and very debonair. My husband, who is a native Spanish speaker would probably prefer
Vincente over
Vincent.
As an aside, I have known a girl named
Vincenza - which is fairly uncommon in the USA. She was small, dark hair and quite lovely. The name suited her.