Most of these points are silly, and the first two misleading.
The Touch games are not good games. They’re ok for passing a few minutes on the bus or whatever, but individually they just are not great. You can cumulatively spend a lot of money on a lot of poor/boring/pointless/short games. You are correct that there is far more selection in Touch games, but there is also about 40% redundancy, where there are multiple versions of the same poor/boring/pointless/short games.
The only point you really score on is 5. The Touch’s functionality is wider–because it’s designed for lightweight Internet use and music. This makes it a poor gaming platform. OTOH, the DS is not as diverse, but is an excellent gaming device.
I respectfully disagree with you about the (lack of) quality of iPod touch games. There are many, many hundreds of very high-quality games that offer depth, challenge and replayability — in all genres. If you think iPod touch games are limited to Simon-says knock-offs or lame platformsrs, I encourage you to spend some time with a friend’s iPod touch (and access to the iTunes store) for a few days!
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