Another consideration is the types of games that are available on each device. I might be mistaken, but it seems to me that more 'hardcore' games are best-selling on PPC, and more 'casual' games predominate the Palm market.

If you want to play lots of shooters and strategy games, you might be better off with a PPC. If you like puzzlers and word games and these types of games, you'll probably be better of gaming on a Palm.