Gathering some opinions, I see at least four strong contenders...
Agile Probably the strongest offensively
Powerful, I could see 10% less time stunned being the difference between life and death
Capacitive, I remember reading that it has a lower chance to proc against players, but the straight damage might still be worthwhile for dropping people.
Tyrannical, the obvious choice, but I haven't unlocked it yet.
...Destructive lulz dat chaos bolt reflect clearly BIS
How would you rank them?