** Damage types ***
Gurista/EoM: 75% kin | 25% therm
Angel: 70% exp | 20% kin | 10% em
Sansha/Blood/Amarr: 50% em | 50% therm
Serpentis/Caldari: 50% kin | 50% therm
Gallente: 50% kin | 40% therm | 10% em
Minmatar: 50% exp | 20% em | 20% kin | 10% therm
Mercenaries: 50% therm | 30% kin | 10% exp | 10% em
Rogue drones: 70% exp | 20% kin | 10% therm

Best Damage to NPCs
Guristas - Kinetic
Serpentis - Thermal
Mordus - Thermal & Kinetic
Blood - EM & Thermal
Sansha - Thermal
Angel - Explosive
Mercenary - Thermal

Combat site anomalies are ranked in difficulty by 10 levels, these are:
(Faction) Burrow / Drone Collection (easiest)
(Faction) Hideaway / Drone Cluster
(Faction) Refuge / Drone Assembly
(Faction) Den / Drone Gathering
(Faction) Yard / Drone Surveillance
(Faction) Rally Point / Drone Menagerie
(Faction) Port / Drone Herd
(Faction) Hub / Drone Squad
(Faction) Haven / Drone Patrol
(Faction) Sanctum / Drone Horde (hardest)