Dmg used by different rats:

Kinetic/Thermal
Guristas (Caldari)
Caldari Navy
Gallente Navy
Minmatar - ALL
Serpentis (Gallente)
Mordus (Caldari)
Komni

EM/Thermal
Blood (Amarr)
Sansha (Amarr)
Khanid (Amarr)
Amarr Navy

Angel (Minmatar) -> Exp
Thukker - Exp/Kin/The
Roque Drones - ALL

Dmg to use against these rats:

Guristas (Caldari) - Kin
Angel (Minmatar) - Exp

Thermal
Serpentis (Gallente)
Mercenary
Amarr Navy

EM/Thermal
Blood (Amarr)
Sansha (Amarr)
Khanid (Amarr)

Mordus (Caldari) - Kin/The

Gallente Navy - The
Caldary Navy - Kin
Minmatar - Exp/EM
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If I wanted a fair fight I would've stayed in highsec.