I standardize, but use different film/dev combos based on situations. Right tool for the right job and all. I am testing a few new developers, though, so I will say "mostly Rodinal" because that's what I'm using right now, but I want to compare with something with more acutance yet not quite out to FX2 or something. I'm not a homebrew guy at this point.
slow: Pan F plus or Efke 25 - still figuring this out. Mostly Rodinal, though I am considering something like D76 1+3 as well.
100ish: I got FP4 in Rodinal 1+50 figured out, but I am shifting towards a newer emulsion - Delta 100 - in Rodinal or Perceptol 1+3 or D76 1+3
fast: TXT from 200>6400 in Perceptol 1+1, Rodinal 1+50, or Microphen depending on EI
ultra fast but high contrast: Delta 3200 in Microphen.
Sounds like a lot of magic bullet searching, but it's really not. TXT is my go-to film in general.
allan