[Corsair]

I would say it's a matter of overall personal feeling and one's definition of what a sim game should be (I've been since more than 20 years in the flight sim world and this a debate we had thousands of times)
It's just that at some point it feels right for you. Depends also where you started. You've always played GWX, I played NYGM from the start. I have played several versions of GWX, and although I am very admirative of the huge work and historical research behind, I always went back to NYGM. Can't explain precisely why, although I specially appreciate Hitman's Gui for NYGM 3.4, which leads you to use your sub close to historical behaviour (dark night surface attack with UZO, Observation or attack scope following weather conditions and ambient light)