What's your opinion about these 2 systems?
For me a portable system means that is able to join you in every trip for many hours even if it is plugged out.
The psp ngp has a battery life around 3-5 hours the most...
Neo Geo should have about 10-15 hours but noooo this thing has ......... 40 (yes fourty)hours to spend for your gaming pleasure, now that's what i call portability!!

1 more thing Neo Geo pocket had a $69.95 retail price, while psp2 seems like 300-350$ the least (omg)!

There's still too much gap between portable devices and the power needed to do fun things with them. Phones are getting to a point now that makes them more enticing, even though they usually aren't x86 based. In a few more years we'll likely have mobile devices able to run RetroCopy. Then a few more years on top of that before battery life is high enough.