Silent Hunter was very moddable you could go from arcade to sim and various other factors. UBOAT while harder lacks that modularity. it will have in future but for now your somewhat stuck with default settings not everyone likes.
I must say that i like actual dynamic campaign, in which apparently you can set how much impact player can have on war, and can actually impact Supply situation in britain to limited degree for example. While it wont be possible to win the war it will be possible to lenghten it and im fairly sure there will be mods going full Wolfenstein. + Game has Support for Campaign and not just Sandbox meaning you might have various tasks such as sink particular ship etc, Which might make it interesting. And i like the HQ feature allowing you to use experienced officers from your ship in HQ to for example Speed up Setting Uboat Pens in Lorient.
So imho this is gonna be succesor. Its just currently its in Silent Hunter V at release state.
