SQL Server Vs Oracle

My friend Pinal Dave (http://blog.sqlauthority.com/) posted one very good article on "Differences in Vulnerability between Oracle and SQL Server". This is a kinid of topic which will never end.

Its a very good topic and each one one us has different opinion and also every one should take this in +ve mode.
I will not say which one is better here. Coz each of these are best on their own.
Based on my consulting exprience in US and UK, Database servers are decided based on the following factors:

1) The application which is used to access the tables. If the front-end application is in .net or any of the microsoft products then default database server is SQL Server. If the front-end application is in Java then default database server is oracle.

2) selecting database server is entirely based on the big picture of enterprise architecture. if the firm is using SQL Server right from the begining then they preffer to go with SQL Server than changing the whole architecture.

I know these are not the only factors but these are the two answers i get normally when i review the architecture.

On the other-hand, what i have seen now a days, people are looking more towards vertica or Sybase IQ or Netezza. which are mainly for datawarehouse applications. So i think in the next 2 to 3 years there would be a huge changes to various database architectures.