I use both 400 and 200 in both 35mm and 120, develop the 120 in Rodinal and 35mm in either D76 or Firstcall film developer AKA Rollei RHS, I prefer the 400 as I often am using an orange filter, so my 400 becomes 100. I shoot normally at box speed, unless the weather is very dull, when I will shot at half box speed, also, with 400 it allows me to shot hand held in dark conditions such as inside museums etc, in D76 35mm is not to grainy, and I have made exhibition prints up to 20/24 from my 120 negs with no problems, I use either my Rolleiflex or Rollei or Microcord or one of my many folders, I have made 12/16 from 35mm in either of the 2 developers, bit of grain but nice grain,
Richard