Karen,
I think the most important thing to consider is your tessitura and which roles lie most comfortably for you. Real contraltos have always been rare, although they can manage the B flat which you have. How are your lowest notes? Can you manage them with ease? Certainly the label Contralto would indicate a darker voice and is your voice dark? It really is difficult to say without hearing you.
Sincerely,
Margaret
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