Guild-Individually strong figures, some tricks but largely simple big numbers in key stats. No healing (except maybe hoffman on constructs can't remember) and only one master can create more minions.
Ressers- great durability and minion creation/recycling. Many units have very limited kill power.
Arcanists- Mixed bag, Skirmishing beastmaster, ice themed blaster, spider themed inventor with summoning/buffing and a battlefield controlling showgirl all with appropriate minions.
Neverborn- As of book two they now have strong reliable minion upgrading, battlefield control, skirmishers and action denial.