Some NPD numbers (3DS(2013) vs PSP(2007))
March
PSP: 180K
3DS: 230K
April
PSP: 183K
3DS: 113K
May:
PSP 221K
3DS 114K
June
PSP: 290K
3DS: 225K
July
PSP: 214K
3DS: 150K
August
PSP: 151K
3DS: 130K
Total:
PSP: 1239K
3DS: 962K
You don't want to see DS numbers...
The PSP barely edges out the 3DS and it got those numbers with the iPhone barely being a month old and a non-existent Android user-base.
The 3DS' sales, in comparison, are far more impressive considering the massive amounts of smart-phone users and how much more fiercely competitive the portable space has become.
So excuse me if I'm not impressed by your comparison and that I feel the 3DS is selling very well given it's very different (and more difficult) circumstances.