I would have to say Psychological build with electric and a little bit of the shadow tree but I'm not sure. It's not working too well for me. I have 2 shock therapy, 2 electric shock (the one that regains focus), wraith form, ultimatum, 2 Terrify. Any tips?
I say there is no best class; they all have viable traits. Biologicals, an infinate 1-man stun lock, incredible burst damage, and can have a good amount of HP. Psychologicals, composed of situational abilities and damage, have a good 1v1 defense and ones that spec into the electric style of play have a guarenteed kill combo, with them being able to do NOTHING about it. I forget the combo though; it's been too long. And Hydraulics. Posessing, arguably, the best defensive capabilities in the game, are great team players. Just make sure your Veradux & Roald/Felicity teammates have a good attack, or you'll almost never win fights against Riot Police(First Aid FML)and some other bosses/encounters.
And tips? I'd go with either a pure electric or shadow build;Hydraulics are the only hybrids in Sonny.