I always recommend getting the disc, but that's my personal preference. You can download it from Amazon for a good price, and if you go there through the link at the top right of the page Subsim will get a small cut, at no extra cost to you.
As for gameplay, you have the choice of the four main types of u-boats (II, VII, IX and XXI) and a completely random campaign that will take you all the way through the war. You will also have a full crew who can be shuffled to different stations, wounded and killed. There are four major supermods that improve the game in different ways, and there is SH3 Commander, which gives a randomized database of 1.7 billion crew names and gives a name, cargo load and crew number to every ship you sink.
As far as adapting goes, there are differences but I think you'll find that SH3 is easier to learn.
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“Never do anything you can't take back.”
—Rocky Russo
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