How to choose light version of database system

Question

I am starting one POS (Point of sale) project. Targeting system is going to be written in C# .NET 2 WinForms and as main database server We are going to use MS-SQL Server. A

Answer 1

SQL Server Compact

It's designed for embedded devices (i.e. Windows Mobile), but can also run on PCs. It's 2MB, runs in-process, single database file, that can have whatever name you like.

Its meant as a local high-performance database. You can't connect to it remotely, and doesn't support stored procedures, or user-defined functions.

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But to answer your actual question: how to choose?

Choose what have management tools, with an easy, compatible, upgrade path when you outgrow it.