There are some variables which control the graininess of a developer
- how strong is the alkali
- which developing agent is used
- is there a substance which solves silver
From this point of view, the developers ar similar.
- Both have use a very mild alkali (borate)
- both use a phenidone kind developing agent. Microphen has phenidone, XTOL has Dimezone which act similar
- both have a high content in sulfite which dissolves silver. Both have 85 g/L
The main difference is the redox system. Xtol uses ascorbate, but Microphen hydroquinone.
I don't think that you see a difference grainwise.If there are slight differences they can be matched by a slight variation of the developing time.
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