Forget the tactical benefits of Flashbang for a second and tell me which of the two you think is better. They seem very functionally similar and I can't decide which one I should use. The only real difference I can tell is Pulse's damage radius is spherical and Lightning's damage radius is conical.
-
Lightning, great for PvP due the fact you can stick to walls and isn't as noticeable and has higher Damage spike and Great for PvE since you can get emenies behind walls with a well aimed throw. Along side with Armentarium ( pretty sure that's spelled wrong) you get two so double the hidden spikes coming form it. All from experience as a 31 Titan :)
-
Pulse is really good for keepin enemies off objectives better. Lightning is used for very good crowd control