I need to purchase a Horseman rollfilm holder for a 6x9 camera. They come in eit her 120 or 220 versions. My questions:

Has anyone tested the film flatness for 120 film versus 220 film for Horseman ro llfilm holders?

Has anyone performed this test with the Mamiya 7 or Linhof Technorama 612PC II ( cameras which can use both 120 and 220 film) to see if indeed 220 film was super ior in terms of film flatness?

Does anyone have a preference in this matter (from personal experience using bot h 120 and 220 rollfilm holders). Pros and cons of going one way or the other.

Thanks much.