In the latest month the gap shrunk by 306,707 units in favor of the 3DS when compared to the PSP. In the last 12 months the PSP has increased its lead by 232,266 units. The PSP currently leads by 2.33 million units.
An important note is that the two handhelds launched at different times of the year. The PSP first launched in December 2004, while the 3DS launched in February 2011. The 3DS has sold 73.56 million units, while the PSP sold 75.89 million units.