SWORDF1SH on 14 September 2014
If you're talking about the USA, it could be close. If you're using Amazon data use the data for the whole year. It shows that the PS4 is ahead slightly. PS4 at #13 - X1 at #14. This shows that it could be close but also shows the PS4 has the edge.
http://www.amazon.com/gp/bestsellers/2014/videogames/ref=zg_bs_tab_t_bsar#1
