What are the best retainer options after Six Month Smiles?

My 6 month smiles treatment was somewhat minor; I had a protruding canine, overbite, and crossbite. My dentist intends to use a permanent, wire retainer on both top and bottom but I'm not sure if I want that. I learned that my teeth move very quickly b/c I recently failed to wear my elastics for a day and my bite began to open up again. I understand that "best retainer" is subjective but I'd like to have some orthodontic feedback on this (I had my braces placed by my dentist vs orthodontist).

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