C# .NET - Which is better watin or Selenium RC

Hi

I want to know which is the better tool for implementing the testcases for a webapplication and pl tell me the features both has got any help will be valued the most

Thanks

I have tried my hands on few UI testing tools including Selenium (but not heard of watin). And Selenium tops all. 

And you should be surprised to know that they released a http://selenium-ide.openqa.org/ for Selenium