There's a few threads about the differences between various 150mm lenses both Schneider & Rodenstock made two versions of their Symmars / Sironars.
Over the years I've used Xenars, single coated Symmars, Multi coated Symmar S's, Sironar N's and in reality there's virtually no difference in the quality of the resulting images, the Xenar's don't perform quite as well until stopped down.
By the time Multi-coating became common most LF lenses had reached a very high performance level, and apart from Congo (and re-badged Congo lenses) the quality from all the manufacturers was excellent, Nikon, Fuji, Schneider, Rodenstock.
Many people say that some of the Apo lenses are the same as the pre-Apo versions and that the manufacturers added the word Apo after it became a selling point for smaller format lenses.
Personally I prefer German optics over Japanese, but this is just taste and like prefering Leica M series optics over Noikon or Pentax, they are designed to slightly different optical criteria.
Ian