That, sir, is a matter of opinion. They definitely cater to different audiences, so there is a clear choice, it just depends on what kind of gaming experience you're looking for.
For some reason DS vs PSP has been an issue of kiddie vs hardcore. I think anyone making that argument doesn't know what they are talking about, and it's not a discussion worth having. imo, the DS offers more innovative titles that could be played in short bursts (the point of handheld gaming, imo) while the PSP offers the console experience in a smaller package. So that statement about having a stronger lineup is true for either system, it just depends on what kind of gaming experience you're looking for.
I try to stay out of fanboy pissing matches, and I'm truly not trying to start one here, but I can't just let a statement like that go unchallenged.