Hello and welcome to SubSim
Both GW and NYGM are really good mods. I went for GW because it was closer to the type of game I like playing, but my suggestion would be to try them both and make up your mind for yourself. In a nutshell GW is more graphically demanding and NYGM is aiming to be closer to reality. To tell you the truth both have almost the same level of difficulty for me (NYGM is probably slightly more difficult but there are no real differences in that department)
GWX is a totally different story though. It is the next level of the SH3 evolution and in my opinion it would be unfair to compare it with either GW and NYGM. It is comming out in a few days and it's a MUST
