.NET Questions

I have done database work with Borland C++ Builder and Paradox, and with
..NET and SQL Server and Paradox. I am considering a new projects with
..NET in either VB.NET or C# and I want to select between either MySQL or
PostgreSql as the database.

I want ideas on which database would be the best choice and for which
reasons. I have a preconceived bias towards PostgreSQL because it has
had COMMIT and ROLLBACK designed in from the start, and because it now
has a native Win32 port.

I would also like information in the interface between ADO.NET and
either above database. I am especially interested in any information
one wants to share with me about PostgreSQLDirect .NET from CoreLab, or
any other comparable .NET data provider for PostgreSQL.