I would assume the PS4 should win this year, because it has two extra months (although january and february aren't the most important months saleswise, they still play a role), and the Switch has most likely not yet peaked, and while I do now believe the PS4 peaked last year, it will still do better than its first calendar year this year. The Switch still has a couple of years to grow and peak, so comparing the two consoles in the current timeframe is misleading. A better comparison would be to compare the PS4's first calendar year with this year for the Switch (If we assume the added benefit of the Switch launching will make up for the PS4's January and february 2014).
The PS4 in 2014 did 14.3 million as per Sony's own figures (sell-through, not shipped). This doesn't seem an insurmountable number for the Switch if they can get their production up and running.