It depends on a bunch of factors but I think torpedo type and how you're maneuvering is more important than sub type.
I generally don't bother firing unless I'm straight and level. Too much risk.
With early torpedoes like the Mk 37 in the '68 campaign I don't risk firing unless I'm under 10 knots. Those swim-out fish suck.
With Mk 48's I generally try to be under 20 knots, usually 10 again to be sure.
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