That depends on what you want to do
armourtech is out, no equipment for you class
armstech not overly useful for your class
its a choice between making your own armour (Synth), Biochem making stims/healthpacks, Cybertech making mods, droid parts, ship parts or Artifice making hilts, crystals and offhand focus/shields
bio will make you money end game
I like Artifice but im only low level,
Other people are saying raid gear is better than crafted, but I dont know if this will still be case long term, ie future devs