You left one out of the list to choose from, Uboat War Ace Campaign 2.0(the poor little forgotten Supermod),besides having to choose "Other" for it(UBWA deserves better) I would have picked this mod, since it is my favorite, GWX takes a very very close 2nd place choice. So I did not vote.
Like Rubini said :
Seriously, this is not a easy answer and perhaps this is not the best way to find what you want. All big mods are very good for what you want and at same time all big mods don't have all the mods that you will want for sure.
This community is very creative and all days we have new nice mods. What you need is play and play and then with time you will know what you really want from here or there.
Play and see by yourself. A lot of mods could be sometimes difficult to choice but at least you have choices!
Good hunting!
Rubini.
It all comes down to personal preference, so best thing I can suggest is try them all.