Why don't you just open them and read the ATIP?
In my experience current Verbatim AZO blanks (with Verbatim / Mitsubishi ATIP) are pretty bad, as is most other CD-R media. The printable "professional" Verbatim media (medical grade, clear cake box with a white label) is just OK-ish, i.e. not as bad as the normal retail one.
If you can, get FTI made TDK CD-Rs, CMCpro Tayio Yuden (avoid the value grade ones, which are really B grade), or Traxdata Pro Ritek. In my experience (limited, would probably need 10+ spindles each to be statistical relevant) those are still excellent to good quality. None of those match the insane low BLER of old TY, though.