I would like to start out and say that I have owned a Nintendo Game Boy Advance SP (GBA SP) Game Boys and I currently own a Sony Psp Sony Psp Link. The main difference between Nintendo and Sony is that Nintendo has been in the gaming business for a long time and is aimed more for younger kids, while Sony is more for teens. The Sony Psp is a portable Dvd player, Mp3 player, picture slideshow player, and video game player. Most of Nintendo's portable game systems are only game players and Mp3 players. The down side to the Psp is that you are going to have to buy a larger memory card if you want to have more than 6 songs, and you have to re-buy the Dvds if you want to watch them on your Psp. The Nintendo Game Boys need a special memory card to play songs, but the memory cards are weak and the Game Boy's sound quality isn't that good. Nintendo has 4 recent Portable game devises, Nintendo Game Boy Micro, Nintendo Ds (Double Screen), Nintendo Game Boy Advance and Advance Sp. Sony's only portable game system is the Psp. The Psp is about $175.00 on ebay, and The Nintendo Ds is $75.00 The Micro is $50.00, the GBA SP is $50.00,