The Delta films are usually reckoned to be intermediate between the two; less tolerant of exposure errors than Tri-X or HP5, less grainy than either, and more tolerant of exposure errors than the equivalent TMax films. I haven't found Delta 400, the one I shoot the most, to be meaningfully grainy compared to TMax 400 or Tri-X, and it is generally a trooper. Delta 3200 is great when you need it but I prefer Neopan 1600 for general high speed use; the Delta film is grainier and has an odd exposure curve IMHO. I have little or no experience with Delta 100; I generally shoot FP4+ when I want something around that speed, which is a delightful film.
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