OK Nick, here's the comparison chart as promised, its only a few of the total published.
Ilford Developers Higher resolution
You will see the main developer types:
ID-2 MQ ID 67 PQ Universal film & paper developers
ID-3 M only Soft working developer for films or papers
ID-20 MQ ID-62 PQ Film & Paper developer (fine grain if used quite dilute).
ID-11 MQ ID-68 PQ (Microphen) Fine grain film developers
ID-19 MQ ID-72 PQ Clean working Industrial, Aerial photography, x-ray developer.
ID-14 Contrast developer, for films and papers.
Of course Ilford have published many other formulae, using other developing agent etc but these give you something to start with, all companies produced a similar range of developers. The commercial version of D19 is more likely to be closer to the D19b variant.