Is grade 8 or 12.9 stronger?

Could you please clarify for me which grade or standard we're comparing here? Are we referring to the hardness of a material, perhaps a grading system for cryptocurrency security, or some other type of metric? Without a clear context, it's difficult to definitively state whether grade 8 or 12.9 is stronger. If you could provide more details on the specific application or industry, I would be better able to address your question.