In my experience, the metal screw-on are (usually) better protectors. I state 'usually' because sometimes lens makers don't account for the spacing needed to keep the cap (or filters) from rubbing the center of the lens. Second best are plastic slip-on style because they're very convenient and don't pop off as readily as pinch-style caps do. I don't like pinch-style caps unless none others are available in the right size.
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