What Sql Server do you use ? If you have time please comment why do you use this servers !
I use Mysql and Postgressql because are free and are very good for small and medium applications and both have a very good support on Internet.
Oracle - using express I can quickly deploy new applications for proof of concept while having enterprise level support for production needs
MySQL - easy to deploy in a proof of concept but shown to fail during bench marks versus competitors.
Postgres ~= > Mysql ?
SQL Server exclusively because that is the decision the managment in my company made with respect to our database direction.