Best Damage in Abyssals

Exotic - Scourge (kinetic)
Electrical - Mjolnir (EM)
Firestorm - Inferno (thermal)
Gamma - Nova (explosive)

Best Damage to NPCs

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

ECM

Minmatar - Ladar
Caldary - Gravimetric
Gallente - Magnetometric
Amarr - Radar

Offer rewards (LP)
1.5K - +1 Attribute Implants
9K - +2 Attribute Implants
10K - +3 Attribute Implants
15K - Special Connections Skill Books
100K - Navy Issue Frigates
250K - Navy Issue Cruisers
300K - Multiple +3 Attribute Implants
400K - +4 Attribute Implants
450K - +5 Attribute Implants
500K (+ rare tags) - Faction Battleships
600K - Pre-built Faction Battleships

DAMAGE TYPES

Damage done by:
Guristas = kinetic/thermal
serpentis = thermal/kinetic
blood raider = thermal/em
sansha's = em/thermal
angel's = expl/kin
minmatar = expl/kin
ammar navy = em/thermal
mordu's legion = thermal/kinetic
mercenarie