Lightning is more powerful but shadow is more tactical, so if you want quick easy kills then go with lihgtning, but if you want to do it tactically and effectively more safely, then go with shadow
How to kill the baron as Psychological at lvl17:
Terrify (4/4) --- Free Will (4/4)
Betrayal (4/4) --- Retrogade (1/2)
Overdrive --- Epiphany (4/4)
Psychopath Form --- Insecurity (2/3)
Equip 1 of everything APART from retrogade - also, when on low health, betray ROALD, not VERADUX