While I agree with the idea that film/developer, or film/developer/paper/paper developer choices are essential, most of the discussion so far has centered on the technical aspects involved in the processing. It might be helpful to consider the aesthetic aspect of Brian's original question within that "combination" context.
To me, T-grained films have a certain crispness that tends to give the resulting images a "technical" feel, while traditional emulsions tend to have a "softer" look, even if developed for a balance between fine grain and accutance. Thus, my preference is to select the film/developer (and paper/developer) combination that best suits the subject matter (well, really, how I want to render the subject matter). So, while I might personally prefer the look of FP4+ for much of my work, I also like the look of Delta 100 or Fuji Acros for some subjects.
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