Nintendo Switch will probably outsell the PS4 this year, so I say 2017 was the last year PS4 outsell Nintendo Switch.
Again, I think it is a bit of a nonsensical comparison to even make though; considering the two consoles are in different phases of each their respective life-cycles, it doesn't really provide much information on the console's trajectory (or relevant relative growth or health of the consoles) compared to Year-over-Year self comparisons or launched-aligned comparisons to other consoles.
And even then, I think PS4 and Nintendo Switch are differentiated enough that the real focus should be each companies own performance compared to their past platforms (such as: PS1/PS2/PS3/PSP/Vita (individually) vs. PS4 launch-aligned in HW/SW/Annual Profit/Etc.)
Is this topic really going to be brought up again when positions are reversed and PS5 begins selling and Nintendo Switch is much farther in its life?
Even in the context of concurrent software releases for each platform each year, I don't think the difference of missing or surpassing each company's own hardware projections by +/- 10% really effects anything that is already in game dev pipelines at this point.
