In my opinion, the bismarck is the best BB3 that I have played. And I have played all US, UK, and KM BB3s.

Advantages are:

range (of course)

spread (compare to other bb3s)

gun angle (30)

gun firing arcs (can point all guns almost totally forward / backward)

size (compare to OP 2 and Hood)

Disadvantages:

damgae (lowest in tier, I think)

speed (37/38, not fast, but manageable)

AA ability (only 3 slots each side)

I highly doubt you only have 1 BO reset from event, so you can try to and if don't like change back.

If you use search function in Kriegsmarine section of forum and search for "Bismarck" as subject you'll find several threads with quite detailed posts about these two KM BB3.

Totally agree with axyarthur. Bismark is super. I know some ppl like pro2 because of its speed and damage. After a long try, I still can not get used to it, which largely indicates the the perference of ship mostly also depends on the individual style of operation.

Stick with the O-Pro.

The remodel has 1 support slot more than the Bismarck, which is the main point if you're levelling.

The fully correct answer would have been to level up a Bismarck BO as well.