When I first started taking photos in the early 70's, there was a general preference towards reducing grain and retaining detail in shadows and highlights. Consequently, I shot most of my early stuff on ISO 25, 50 and, occasionally, 100 film.
Also, grain was seen as something to be eradicated or, at best, tolerated to get a reasonably sharp shot in difficult lighting.
These days, I keep a bit of a mixture of film types and speeds handy and try to match the film to what I believe would best suit the picture I want. Others I've spoken to have said they shoot everything one (or two at most) emulsions.
What's your opinion / preference? Is this a "style" issue?