Where I encountered the metal studs, I used sheet metal screws for the shelving anchors. Now these were the style that would not typically experience a pulling type force, all of the force was basically vertical. I with above, the toggle type will provide the strongest support, and the plastic inserts probably almost none, as I have had these shear off when the screw was inserted at the metal stud, then they pull out easily.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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