Just to save you some testing, The Holga film is just rebranded Foma, so Arista.EDU, Fomapan and Holga are all the same film. I have shot a bit of the 400 and find that the 100 and 200 are much less grainy. I have a decent stock of 400 for the various shots that I think I would like grainy, but the 100 is my go-to "cheap" film. I use Rodinal for my Foma based films BTW.