I bet the external layer black carbon blade is the fastest. I mean where the carbon is literally the outside layer of the blade.
https://www.aliexpress.us/item/2251832661437094.html?spm=a2g0o.productlist.0.0.27477c60sZChmY&algo_pvid=a9db53a3-dd62-4734-b19d-3be761bf4e51&algo_exp_id=a9db53a3-dd62-4734-b19d-3be761bf4e51-20&pdp_ext_f=%7B%22sku_id%22%3A%2265192925494%22%7D&pdp_npi=2%40dis%21USD%2149.0%2144.1%21%21%21%21%21%402101e9d016634788985722863e7d96%2165192925494%21sea&curPageLogUid=hji1c7cKJyR4
how much do you bet ???
You might loose.
Just because the outer sheet is a thin layer of carbon , one can not draw final conclusions from this.
It really also depends what is underneath the carbon.