I always preferred the Pacific theatre and fleet boats to the Atlantic and U-Boats.
That said, U-Boats do present some challenges: less fire power, less speed, primative radar (if at all), and a technologically advanced adversary (especially in the later years).
In my view, the u-boat's key advantages over the fleet boats was deeper diving depths and later, the snorkel, both of which are defensive advantages.
The fleet boats on the other hand, had speed, fire power, and radar, all of which are advantageous offensivly as well as defensivly. I think fleet boats give me more tactical options and flexibility to make game play interesting.
That said, I do still enjoy the odd U-boat cruise for atmosphere.
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