No comparison.
comparing Uboat to Wolfpack is like comparing Company of Heroes to Post Scriptum
yes, those both deal with the same era of warfare, but the play-style is barely the same species between the two.
In wolfpack you will be crewing a u-boat FPS style with your online friends
in U-boat you will be all single player while managing a crew of 20-25 sailors and officers in a sims style interface with first person options.
both games i am sure shine on their own merits.
but again, its like comparing chess to checkers if you will
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