Well that's a 350 difference in HE power alone and USN bombs are also lighter (Less AP damage).

A DB centric setup i'd take IJN over USN.

IJN fighters are fast (same speed as USN) and their bombers are not far behind USN bombers in speed while having far better bombs.

Hm ok, but IJN Fighters are the worst of all nations, right? So would KM be a better choice if you want "not sooo bad Fps" and good DBs?

IJN is not really all that bad. Their the fastest and you don't really want them going toe to toe against enemy fighters swarms.
You want them to scout for your DBs and divert the attention of fighters that could potentially kill your DBs in a matter of seconds.

Also KM while it has one of the better fighters out there and semi decent bombs (they're totally average TBH) the fuel time on their bombers is pretty short (shortest in fact) standing at 130 seconds (compared to the average of 160 seconds) for no apparent reason.

If you really want good fighters and manageable bombers then take MN. 

When it comes to fighters, I'm pretty sure UK has the worst fighters  due to low fuel from what I can rember and  crap attack power and speed.

Hm. Thanks for the replies so far.

But what does "flying tanks" mean?

Do the SN Bombers and Fighters last that longer against AA and enemy Fighters? 

And is it really an advantage, when IJN fighters are very fast, but go down even against lower fps? 

Oh come on people. IJN is not THAT bad.
They just need 200 vets and you can stand up to ghosted USN pilots.

Besides why are we talking about fighters when the OP wants to BW so fighters don't really maatter all that much.

SN bombers are called "flying tanks" because they have more DP and armor than most nations at the cost of speed.
In fact most SN aircraft are pretty slow.

It doesn't matter what bombers you use, if you can get the most sucessfully hits the fastest, you'll score the highest attack.



I've gotten 250-300k range in US T1 DBs in the same ammount of time others can get the same attack in SN and MN.


DBs is a matter of who is the fastest at multi-tasking. Get the most successfully waves out the fastest with minimal time spend lining up to drop. Get those done and regardless of nation you'll be sucessful. You'll easily outscore someone spending 30 extra seconds to hit a target than if you make sucessfully full run hits within 10 seconds.


The fastest and most efficient player will always win out. 


Simply find the nation with the best balance of speed, damage per bomb and planes and go start grinding (Make sure you watch tutorial videos on Manual DBing and effective DBing strategies first or you won't be very sucessful)