Big fan of all 3!!
Scharnhorst got a much-needed boost when secondaries got upgraded recently, but you still need to play carefully as 283mm guns don’t perform particularly well against other BB’s.
Tirpitz is very much like the Bismarck, but you get the added bonus of increased lethality when you end up toe ping someone at close range.
Pommern is very tanky and benefits from the slot 6 secondary module - allowing a truly massive volume of secondaries to get going. You do have to be careful how much angle you give an opponent you are charging, though and not open up your broadside until you’re sure you can handle it.