This Friday I’m buying the last few paints I need but have enough for a character and 3 units

Hey so I’m buying the last paints I need and decided to also pick up 3 more units I’ve already decided on an apothecary and then either 2 eradicator units or 2 more aggressors units as I want 12 and already have 6

Also if people recommend it I’ll buy an apothecary biologist as well as I’m undecided what is better a biologist or a captain in gravis