Here is some useful info:

*** Damage types of ***
Guristas - Kinetic / Thermal
Serpentis - Thermal / Kinetic
Blood Raider - Thermal / EM
Sansha's Nation - EM / Thermal
Angel Cartel - Kinetic / Explosive / Thermal
Minmatar Fleet - Thermal / Explosive
Amarr Navy - EM / Thermal

*** From weakest defense to strongest ***
Guristas - Kinetic/Thermal/Explosive/EM
Serpentis - Kinetic/Thermal/EM/Explosive
Blood Raider - EM/Thermal/Kinetic/Explosive
Sansha's Nation - EM/Thermal/Kinetic/Explosive
Angel Cartel - Explosive/Kinetic/Thermal/EM
Minmatar Fleet - Explosive/EM/Kinetic/Thermal
Amarr Navy - Explosive/Kinetic/Thermal/EM