I always take only TI torpedoes. But I thought that's because I'm a lame and need their speed to actually hit anything.
More serious -- every time when preparing to the patrol I consider taking some TII's instead and usually i take 4 (2 ready and 2 in internal storage), but after that, when it becomes hot in action, I forget about it and curse on the trigger that doesn't want to switch to high speed, or just choose the TI ones (and stay with four TII's at the end of patrol...). But one day I'll make myself learn how to use them properly.
