generally, bigger means less dangerous.
Torpedo boats can be destroyed just with flak, but they'll shoot you up in the process, scoring deck gun hits isn't easy and they can take for more hits than they should be able to, at least in GWX.
Bloody nuisance, fortunately they aren't good at tracking you when submerged.
Armed trawlers are awkward. Their underwater shape is a pain for both contact and magnetic detonators and they pack enough firepower to make a surface battle costly; this should usually be avoided but it's possible (if you have to take them out in close combat, I recommend disarming them with heavy flak).
They aren't as good at detecting you as true military vessels, and the low speed of most means you can simply outrun them if you don't want to play.
Corvettes are escort vessels built to civilian standards, often as dedicated anti-submarine vessels. Worse performance than destroyers, but generally have more trash cans.
Destroyers are fast and become quite deadly later in the war (early on, you can bait them and blow them up as they approach). They usually have more depth charges than they should, but few enough that them running out is a realistic option.
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Durability doesn't matter too much: Any vessel that's a threat to you while submerged will sink after taking 1 eel the vast majority of the time. Bigger vessels are harmless targets when submerged and deadly when surfaced.
Auxillary cruisers are a bit of a special case... many small guns, poor fire control and both seems modeled in game. They are a menace at close range, but take a long time to find their range at a distance... it's possible to sink them with your deck gun before they score a hit. Usual caveat: just because you can doesn't mean you should.
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