As we heard recently, nuclear subs can be tracked by other submarines due to the traces they leave in the water like radioactive particles (don't quite understand that one, does the radiation ionize the seawater around the reactor compartment's hull? There is almost no insulation around the reactor, only forward and rear), but also other elements that betray it.
On the other hand a Diesel sub probably also leaves some traces, but have not heard yet about tracking those.
I would go with AIP subs, when it comes to countries with smaller navies, and budget.
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>^..^<*)))>{ All generalizations are wrong.
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