Yes, the PSP has horrid loading times, no doubt. However, I can play BattleFront2 all week with no problems. I do have a car charger that i can stick it with when it goes low. Id have to say a KEY factor in the reason the DS would outsell the PSP?
DS is what, $100-150? PSP is $250. If your getting it only for games, and have no desire to use the other stuff, why pay the extra Benjamin? If however, you want a system that is basically a handheld pc, and is bios upgradeable, there is only one choice.