Ease of Detection by Active Sonar Differences between U-Boat types?

[Pisces]

So if you must select a type for it's active sonar performance then select one with best turning rate for speed. You want the one that is the best at being able to turn as quickly at slow speeds. (Just came up with this, never tested it myself) It is very easy to get broadside returns when you are down and the destroyers are circling you above. And you don't want to increase speed for a quicker turn. Silence matters.