Have to say I am more of a T1 person, mainly because it allows you to set the speed. So the T1 in effect offers you a better opportunity to make a simultaneous bang than an electric torpedo does. As in convoy attacks making all your shots hit at around the same time.
Though the Electric torpedoes are better mainly because they leave no trail whatsoever as they run to the target, the only drawback of them is they are slow, only 30 knots they go. a T1 can more at 44 knots, I have hit a schnellboat with a T1