Hi, in my honest opinion, whether to get the older snap closure or the newer magnetic closure is really a personal preference. Some the the snap, others (like me) like the magnetic. The other improvement on the updated WOC is the new zippers which (so far) seem less likely to make an indentation in the leather as they seem to have a lower profile. Not sure what will happen over time. I don't know whether that is important to you or not.
As for GHW or SHW, I initially thought I would like the gold and eventually went with the gold but I saw both in the store. They are both very beautiful and it was hard for me to decide between the two, actually. Again, personal preference. I think you should see both in person in order to decide.
No matter which WOC you get, I am sure you will be very happy. Best of luck in your search.