I was just doing the same thing on TT (at least between GFS / NAM). Agreed, it looks to my weenie eyes that the NAM has a slightly sharper ss s/w and a touch more phasing.
It’s freaking wild outside. Temp dropping like a rock (7 degrees in last 15 minutes). Heavy rain with gusts into the 30s already. Ice pellets mixing in so the flip to snow is close.