The bottom line is having a mechanism for delivery of anomalous cold, especially in December. The currently advertised pattern on the EPS would get it done, as would the CMC ens(actually looks unrealistically cold given the h5 look). EPS has the best/coldest look at h5 with a -EPO/slightly +PNA from mid month onward. GEFS has improved in recent runs, but doesn't quite get the NPAC sorted- has a slightly -EPO/neutral PNA look towards D15.
Root for the EPS, although as @WxUSAF said, the pattern progression it has been depicting looks more Nino than Nina, and it has trended towards the GEFS in recent weeks moving from the LR to MR.