Both.

It's much better in the long run to go for both.

Both are incredibly fun.

KM is great as you can really enjoy leveling 2 BOs and getting your crew ahead.

Like the others have said the best way is to go down both in order to have a above lvl crew. The differences between the two have been discussed in other threads such as:

http://fm.en.kupaisky.com/Community/Forum/View.aspx?num=2379&searchtype=0&pagecount=0&searchvalue=&sort=5&category=A04&page1=1 and

http://fm.en.kupaisky.com/Community/Forum/View.aspx?num=1002&searchtype=0&pagecount=0&searchvalue=&sort=5&category=A04&page1=2

I would just like to say if you are planning on only doing one line pick the one that is the one you want down the road not early in the game. As a whole the CA stage and BB1-2 stage is only a small part of the grind. Read about the other two bb3's in the threads i gave you to help make up your mind. Personally im a OP2 guy.

if you are planning to have only one bo for KM bb Line then try and find out the pros and cons of each line.

for example the opro line gives you a great aa platform P-pro (do not remodel) and an extra slot for lvling of your sailors. Also you get 9 guns on O-pro2 to the 8 gun Bismarck. Another plus for o-pro line is that you can either SW or AW the O-pro2 .

On the other hand the bismarck line has great bb1 and bb2 and a very competitive bb3. I went bismarck and i did not regret it.

anyhow its your choice at the end. However note that the grind will be very frustrating. Your damage output sucks big time and there too many lvls between the bbs.

So good luck with your choice.

i went o pro line.. and used aa since emden.. very fast lvling..

I have both, but i like the O Pro 2 better than the Bismark