Well, my answer will be try them both like others said. And for my experience, I have been a lot of time with NYGM but now I'm GWX user, why? Because for me It have everything I like (lot of new ships, excellent airplanes covery the Bay of Biscay in late years, excellent campaign and historically accurate battles and operations, and also realism is in proper level also, anyway I play in 100% realism, lot of improved things and I must to said GREAT MOD). NYGM is also great and lot of realism and hard play is there, much less ships then GWX and the NYGM not cover many historically battles, historically convoys is there, also med campaign, the crew managment is perfect. Some things I very much like from NYGM like slideout small TDC dials and assisted plotting mod, I included in GWX and have a game for my taste. Also a lot of help I had from GWX team and when I asked some question I had an answer for that question.
GWX is live mod must say (always some new things around and been implemented in). NYGM team stop the work on their mod, and very little interest here is for improve this mod by now (adding more new ships...). Because of that and much more I'm now a proud GWX user! My personal wish by the moment is to learn "Hardcore manual navigation", and then I will be a real U-boat captain.
