Obviously the GEM is very good.
The problem with the GFS is that the H5 low is further to the north, bodily over sne and a bit weaker....the Euro tracks similarly to the GEM, but it looks to me like the low up east of Greenand is not nearly as pronounced, which doesn't allow the system to dig as much and intensify.
That is correctable.....GEM is closer to reality than GFS...that said...doesn't necessarily mean a big snow storm for sne.