Body Slam has always been better in my experience. Its much easier to spam as you don't need to worry about Ground-Types coming in and absorbing your attack. Ghost-Types are also much rarer, and common Ghost-Types like Gengar do not like taking an Iron Head. While Body Slam isn't guaranteed it still has a really high percentage for a secondary effect. Like other users have said, its all based on your team, but Body Slam is usually my goto move for Paralysis.
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