There is a certain amount of "truth" to staying at periscope depth.
Namely, the active sonar won't get a ping on you at PD. There are l33t (or elite, in a sarcastic tone) destroyers that can accurately fix your position underneath the thermal layer. So, by staying at PD, you avoid these "expert" destroyers and their "asdic of death" lock.
I'm partial either way, and to be completely honest, I save the game just before the first torpedo impacts (I always play with torpedo speeds and target distances to minimize the time between first and last impacts). I try a deep-dive first, and if the convoy pulls one of the super-elite destroyers, I reload and attempt a PD evasion.
As I have mentioned before, Ubisoft's decision to balance the game with "super destroyers" was very poor. They should have changed other elements of the game, rather than put elite destroyers in there. Possibly by not wasting several thousand man-hours on that worthless intro movie, and instead putting that work into the XXI and more accurate modeling of the snorkel's radar cross-section.
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