The worst UI on the planet.
I take it you've never used DB2 lol.
Also, what UI are you talking about... are you talking the database admin stuff? You're not talking SQLPLUS are you? For development you should be using a tool like Toad or Pl/SQL developer.
Of course many use Oracle because it is available on whatever religion (OS) they believe in.
It's not religion, it's simple reality, for mission critical enterprise applications Windows has never been reliable enough. When they measure downtime in thousands of dollars a minute BSOD's are unacceptable.
Also I've been through more than one proof of concept with SQL server as a replacement for Oracle (for obvious cost reasons) and SQL server has never been able to meet performance requirements... despite the fact that we really wanted it to win. So I think your 90% is probably very, very high... unless you are talking about the gazillion access databases in the world.
[This message has been edited by OregonAg (edited 6/4/2012 10:06a).]