Applications that need enhancement or access to new Sybase features generally benefit from migration:
Client-Library supports all current Sybase server features and includes a number of valuable features of its own. (See “What is unique about Client-Library?”.)
Client-Library supports threadsafe applications with reentrant libraries, while DB-Library does not.
Client-Library supports network-based directory and security services while DB-Library does not. (See “Support for network-based security and directory services”.)
Applications that do not need enhancement or access to new Sybase features will not benefit from migration.