I vote for tokyo express + bombardment. The sub combo is nice but Germany has very little need for subs because he has to prosecute a land war against Russia as well, so the interdiction would be better if you want to play the economic shutdown with subs, but interdiction doesn’t really combine well with super subs since the subs you’re building aren’t necessarily attacking anything (in fact they’re probably getting hunted by planes).
Tokyo express and bombardment turns destroyers into a hybrid transport/battleship, which I think it very helpful for prosecuting island wars and such. For the price of one battleship you can get 2 bomabrdments with 2 destroyers, and they can carry 1 inf apiece too! That would be great to take back islands or invade US with all those bomardments and you could easily reinforce manchuria and the like.
Bombers are ok but still they’re expensive and you need to build stuff to shield them with as US; all you’re doing with heavy bombers is nearly guaranteeing a hit per bomber and/or getting high IPC damage rolls. Although this possibly could be very strong against germany if you land bombers in UK, getting the max 10 out of his territory every turn.