actualy the large calliber deck gun is not an advantage, as you carry half the rounds per box of ammo. all told the 88 has more of damage potential vs the 105 as the 105 shells only do a bit more damage stock, and you carry alot less ammo for it.
The IX are slow in changing depth, diving and turning, easier to detect on active sonar (due to the much larger size), and you will be sent alot further for each patrol (which meens alot more time sitting around as you cross the ocean). As for the heavier anti air of the IX, the stock ixb doesnt realy have much more firepower as the first type of 37mm gun is single shot with a 2 second reload, so i wouldnt expect to shoot down much with it.
Other then conning towers, subs typicaly have access to most of the same equipment upgrades (radar, sonar, batteries, engines, etc). Conning towers pretty much just determine what guns (flak and deck) can be mounted.
Realy the main advantage of the IX series is the number of torps it can carry. Range isnt much of an advantage in the long run as you will have to spend alot more time getting out there and back (since your gona get sent pretty far away from base by bdu), which some what counters the advantage of extra torpedos. Oh and structuraly XI's tend to be a bit tougher to sink.
Personaly i prefer the VII series over the IX. Though at some point in my current campaign i will switch to it for a bit (probably starting when the americans enter the war). then go back to the VII
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