DSClassic is a simpler game, focused on balanced gameplay, avoiding minmaxxing and powergaming. We hope to make a game that is more fun for those that do not wish to become as powerful as possible and the DMs that run those games.
In almost all cased a DSClassic character can play in regular DS games. (there are a few rules such as antipaladin and houserules that may come along later, Those characters would be limited to DSClassic unless regular DS adopts the same rules later)