Damage type to protect against:

Guristas - Kinetic & Thermal
Serpentis - Kinetic & Thermal
Mordus - Kinetic & Thermal
Blood - EM & Thermal
Sansha - EM & Thermal
Angel - Kinetic, EM, Thermal & Expl
Mercenary - Kinetic, EM, Thermal & Expl

Drone sentry range:

EM : Acolyte Infiltrator Praetor Curator 35+20 KM
TH : Hobgoblin Hammerhead Ogre Garde 20+10 km
EX : Warrior Valkyrie Berserker Bouncer 58+35 km
KIN : Hornet Vespa Wasp Warden 50+25 km

Main damage type to shoot at the enemy:

Guristas - Kinetic / Thermal
Serpentis - Thermal / Kinetic
Blood Raider - Thermal / EM
Sansha's Nation - EM / Thermal
Angel Cartel - Kinetic / Expl / Thermal
Minmatar Fleet - Thermal / Expl
Amarr Navy - EM / Thermal
Mercenaries Comander/Over Lord - Kinetic / Thermal
Mercenaries Wingman Some Named - Expl / EM
Angels/Gist - All types of damage
Blood raiders/Corpus - EM / Thermal
Guristas/Pith - Kinetic / Thermal
Sanshas/Centurian - EM / Thermal
Serpentis/Core - Kinetic / Thermal