have only stayed there leading up to Christmas, never over the holiday itself..
GF is my favorite of the disney resorts, so i'm happy to stay there any time of year..
leading up to Christmas, it's especially lovely - the decorations are perfect...the gingerbread house, the tree, etc etc...
if i were at WDW for Christmas, i would definitely want to be at the GF...(or if that wasn't available, WL)..
as for concierge, RPC is it..
we stayed in SL once, and then after that only in RPC...
i would never stay in SL again....
if RPC wasn't available, i'd go with WL concierge rather than SL...