Why does everyone fly the D-11 or D-40 instead of the N? The N is faster, right? Is the D-11 and D-40 more manuverable?
Well, Jug guys that fly the D-11 are out to fight. End of story. We go in and dogfight with a 7 ton airplane and actually enjoy it. So far, therapy has failed us. Medication is being developed.
The D-40 is heavier, but climbs better, and when you see one, most likely it's out to flatten the nearest major city with it's ord. Oh yeah, and it has dive flaps. It features more fuel, too. It doesn't turn as well as the D-11, isn't as stable in low speed maneuvers, in my experience it doesn't hold on to speed like the D-11 does (greater drag with that bubble top). D-25 is the in-between. Lighter then a 40, heavier then an 11, same drag problems, but an improved climb rate thanks to the paddle-prop and upgraded engine. Some extra gas, but not as much as a D-40 if I remember right.
The -11 is also faster then the other D Jugs, and accelerates better in a dive, holds on to energy a bit better, and is generally more "fighter" then "fighter-bomber".
The N, however...
The N is a very mixed bag. She was made for the long ranges involved in the Pacific, and they thought it a great idea to stuff gas in the wings. No, they didn't have room, so they just made 'em bigger. A lot bigger. Your guns are farther out, making convergence a tricky issue, and leading to some very unintuitive solutions when at greater and shorter ranges then your conv setting.
However, since they stuffed her full of gas, they thought it'd be a great idea to upgrade the power of the engine. Like 700hp worth. 78" hg at the manifold, and it's a HUGE boon in performance gains. She is MUCH faster across the board. For 5 minutes.
But you pay a hefty price. To stuff all that gas you need gas tanks, space, and that means weight. A LOT of weight. Even at WEP, the N doesn't climb for crap. She'll dive, she'll roll, she'll zoom, she'll even run down a Mustang, but she won't climb.
To me, the 11 is a more then capable airframe- the stability and lighter weight, coupled with the lower drag means that I can run down anybody...because I always come to the fight with an E-advantage. Typically, I'll arrive at the party 5,000 feet above the quarrel, and dive in, and then zoom out before my energy margin runs too thin. Or just dive and extend, whichever. She's plenty fast, handles terrifically at speed, and is more then capable of putting up a fight against anyone provided you have that initial alt advantage.
Maybe I haven't given the bubble-tops their fair shake yet. Maybe I'm an old school "purist" and like flying a 1943 a/c in a 1944/5 dominated arena. Whatever it is, I love my razorback

I'd LOVE to have a D-23 or an M Jug.