In the latest month the gap shrunk by 347,350 units in favor of the 3DS and by 2.54 million units in favor of the PSP in the last 12 months. The PSP currently leads by 2.13 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 68.88 million units, while the PSP sold 71.01 million units.