I need help!

I'm a designer in the process of learning PHP and need some help. At work developers from the IT Dept. keep arguing that asp".NET" is better (for many reasons that they have failed to explain) than PHP. They say PHP can't survive and that it doesn't compare to the speed and agility of ASP.NET.

One of the explanations that I did get is that with asp.net you can comile code into much faster *.aspx files. Is there an equivalent in PHP?

In your opinion what are the pros and cons of each?

Help me win this one please!!!