Biochem will be useful for every single class, especially for all the implants. Other than that artifice will be great for force users as it makes MUCH more than just crystals and lightsabers. Synthweaving will be very nice once you have recipes for moddable armor (also it makes all three classes of armor so it can be useful to any force user).
cybertech will make a FEW things that every class can use but is much more useful to non force users. and then obviously armormech and armstech will be solely for ur non force users.
Good Luck everyone!