After said Ubuntu is safer than Windows, now Dell no longer sell Ubuntu machines on their online store. And according to Dell it's important to make the right OS choice and you choose Ubuntu only if :

• you do not plan to use Windows
  
• you are interested in open source programming
  

What I do know, I use Ubuntu not because of those two reasons. I use Windows application under Wine and virtual machine if I have to, and I am not into programming.
I use Ubuntu for so many reasons that apparently not listed in Dell's category :)
 

 
keyword : dell, ubuntu, windows