You can also press "K" and select bridge officer skills in the combo box located in the right upper corner. All character skills (including deflector-related ones) affecting the selected bridge officer skill are highlighted then.
IIRC, if you use Hazard Emitters and Polarize Hull, look for [EM]. If you use Science Team, look into [DEF]
If you use Tractor Beam, look into [TB]. If you use Beam Target Subsystems or Jam Sensors, look into [SEN] or [SENA].
The bonuses deflectors give you corrospodent to Starship Operations skills, which in turn affect the effectiveness of Sciene Powers. Check the skills that are highlighted for the science powers you actually use, and find a deflector that benfits from them.
Sorry about that; I Mean as a Tactical, what is best ? Deflectors [def], Emitters [Em], or both [Def][Em] ?
Thx in advance for your answers !
As we're trying to explain, Deflectors are nothing more then a bonus to science abilities. Look and see what your 2 science BO abilities are then pick a deflector that gives one or both of them a bonus.