Interesting differences.
Peculiar that the darktable one seems to only have the best pastel representation (looking at the warmer/colder section, top part of the colour checker). The other 2 seem to have trouble with that with the default settings used.
Overall DxO and RT seem to have the more pleasing colour and detail representation. RT has a bit more detail compared to DxO and I think I like the colours just a bit better in the DxO version if I do not look at the colour checker. If I do look at the checker I prefer the RT colours.
Assuming that this would be a starting point for users that use these defaults I don’t think there’s much of an influential difference between 2 and 3.