i believe that theses Ai types be an Hard shell to defeat
The Core + Special Forces Captain.
they are sufficient enough to destroy you thus no need
for random AI types. but an map setup could win you the day.
eg abusing the Special forces captain to gain an advantage due to moving across your worm holes.
best 2 units spiders or Parasites bonus ships
Thus this still makes Ai abuse just with correct Choice of bonus ships.
Thus if it an random Ai type only safe answer is parasites. But defense Is need heavily I would suggest HL and all Parasites on your home planet only attack force is the unit the AI send blindly into your system.
There you go you got an ready made offensive units to attack the Ai with.