Not sure who they are myself? After useing IORs for many years they have proven to be both tops in glass quality and repeatability.
If mounted properly IORs will be as repeatable as they come! Have yet to have an issue other than a soft tube with any of the 6 IORs, alien the rings and dont overtighten!
IOR scopes will have better glass in them without a doubt and be just as repeatable as a NF. If your life depends on just one scope then NF gets the nod but if glass quality is a priority then IOR is the answer. Leupold and the Conquest line dont even come close!!