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When diving doubles you will need to use your wing/BCD to compensation. Typically you can't control your buoyancy only with a drysuit with steel doubles and stage bottles so you will need to use your wing to offset buoyancy.
A lot depends on your suit and your diving style. If you are diving a shell, then I would use your suit - exclusively. Some shells are better at controlling the bubble than others. I dive a Whites Fusion and never use my BCD during the dive. If you are diving neoprene, then your BCD may be the way to go.