I honestly do not see why(as far as a german bomber is concerned) why the He 177 is not the obvious choice, production numbers are irrevelent, the He 177 was produced in numbers at least 5 to 6 greater than the C hog, so this is a mute and pointless point. What is important is that the Germans get a good late war buff and the He 177 is the only logical choice, the Do 177 is no whear near as well defended, and the He 177 can cary a bigger load, which is why we nead a German late war heavy, Better defensive firepowere bigger load, why settle for anything else. I mean it is this simple.
Do 217, weak defensive firepower, smaller bombload
He 177, Good defensive firepower,Good bombload
The 40 some odd mile per hour spead advantage means very little, you will still be intercepted, you will miss that firepower the He 177 has.
This all irevealent and a side topic, the clear choice from the above planes is the Emily, it brings so much to the game that it simply outweighs the competition.