Japanese Red DS on the left and US White DS lite on the right
These are my personal pros/cons for the two different DSes. In other words, the features that cater to me and not necessarily everyone else. ._.
●The screen is dimmer - Not as intense on the eyes when playing in the dark.
●It's heavier - Particularly the base, so it doesn't tip over as easily when playing it on a table. And sometimes I just prefer heavier things.
●The GBA cartridge doesn't stick out - I can just keep a GBA cartridge in the bottom at all times, which protects the GBA slot plus provides an additional game to travel around with.
●Better sound - Overall sound quality is much better. The regular also has the potential to be louder than the lite, though I haven't found that to be necessary yet.
●The screen has weaker colors - Games aren't as bright on the regular DS.
●The screen is dimmer - It doesn't emit as much light, so it doesn't brighten up dark places as much when you need a light.
●It's bigger - Only for VERY specific action games, I might prefer to use the lite to get closer control. But the lite itself has another con that disqualifies this con for the most part anyway.
●Thinner stylus - I prefer to use something thicker when writing. I have less control with the regular DS's stylus.
●Bad strapholder placement - As the picture shows, I have a touch-button strap on my lite (wrap around thumb to use the bottom touch-screen), but not on my regular. If I put one on my regular, it won't lay flat on tables anymore. Uhh... .___.;
●The screen has better colors - Games simply look a little better on the lite.
●The screen is brighter - It's more useful as a flashlight than the regular DS during blackouts and such. xD adjustable brightness
●Thicker stylus - I prefer to use something thicker when writing. I have more control with the DS lite's stylus.
●Accessories - More accessories available for the lite, especially for the stylus such as the extendible styluses I use. I really like my protection case for my lite over my regular too.
●Good strapholder placement - As the picture shows, I have a touch-button strap on my lite (wrap around thumb to use the bottom touch-screen), but not on my regular. If I put one on my regular, it won't lie flat on tables anymore. Uhh... .___.;
●The GBA cartridge sticks out - If I wanted to keep a GBA cartridge on it, it would no longer fit in my protection case (it'd still fit in one of the pouches I haven't opened, I suppose... but those aren't protective). Plus I have to keep the small white replacement for the cartridge with me and not lose it, otherwise it risks getting the GBA slot dirty. Playing GBA games on my lite is troublesome in general.
●Weaker sound - Overall sound quality is worse. The regular also has the potential to be louder than the lite, though I haven't found that to be necessary yet.
●Weaker controls - I found diagonals on the navigation pad to be more responsive on the regular DS. Very important for certain games. With enough practice, one can overcome the handicap, but the fact that the regular DS is more responsive does not change.
I've heard stories that the hinges on the DS lite are weaker, or there was some random scare from a ton of people turning in broken US white DS lites. Take good care of your technology, folks. :X
I also get slight vibes that the processing power on the regular DS is stronger during intense graphic scenes, but that just might be my imagination? I don't know much about the DS/lite specs.