If Arista Premium was offered in all formats, I would never buy Kodak b/w film again (and probably not Ilford either, except for Pan F and Delta 3200), because I would fill three freezers with the Arista!
Unfortunately for Fuji lovers, the price difference between Neopan and Legacy Pro is nowhere near as large as it is between Kodak and Arista Premium.
Also, Fuji 120 film is already by far the cheapest b/w 120 film from any of the big three manufacturers (and perhaps from any manufacturer of decent-quality films as well). I don't know how much cheaper they can make it!
Nonetheless, if it was available, I would buy some 100 for long-exposure pix, just to save a little bit over the Neopan.
While you guys are making these calls, please ask them for Reala and Superia 100/400 back in 120 format. What a horrendous loss for me those were.....