The only requirement that the OpenESQL technology has for any vendor's ODBC driver is that it be ODBC 3.0-compliant. The code generated by the OpenESQL precompiler is agnostic between different vendors. The only exception is if you use the TARGETDB directive to target a specific database. In this case the code generated may be optimized for that specific vendor.

The recommendation on which ODBC driver to use should be based on the vendor's recommendation and would most likely be dependent on the particular database version that you are using.