Kairos on 25 December 2017
Considering in other months both switch bundles were in the top 10 on montly ranking and the ps4 was in the 20's and that ended up with Switch barely outseling the PS4 for 20 thousand units more or less, I think, looking on the montly rank where the PS4 is higher than other months, the PS4 will be the best selling product on NA this month.
I'll predict PS4 - Switch - XB1
