Chaplins are meant to be kept cheap as they come with so much, use them to get a good point vs effectiveness HQ. Chaplins are far better leading assault squads IMO because they don't make the squad a major points sink.
Librarians are there to take out big nastys (such as daemon princes) and to support other units (with say, storm of the emporers wrath). The best way to use Librarians IMO is to give them a terminator command squad and just hunt down really tough nasties, if the Librarian fails, the powerfists of the terminators certainly won't.
Librarians are there to take out big nastys (such as daemon princes) and to support other units (with say, storm of the emporers wrath). The best way to use Librarians IMO is to give them a terminator command squad and just hunt down really tough nasties, if the Librarian fails, the powerfists of the terminators certainly won't.