Let the hive mind of Engadget get that for you.
"I'm in the market for a new phone and money isn't a limitation. I'm also not partial to any particular US carrier, but here are some of the features I'd like to have: WiFi, GPS, good coverage in lots of places, push Gmail (a must!), physical keyboard (a must!), a touchscreen, decent battery life and a relatively slim body. And please, nothing that has a fruit logo on it. No offense to the fruit fans, though. Thanks!"
Despite all those hardware prowess of the PSP, I hope you now understand that those specs don't matter a bit, if the consumer doesn't like the content and how you operate the thing. That's why the DS is outselling the PSP for years now.
Apparently, people love the casual games and the touchscreen of the DS. No matter how fast the PSP runs.