>
> What are the pros and cons of using Synchrotron or Excimer Laser as x-ray
> sources.

The answer is -- it depends. What kind of applications are you looking at?
The questions to ponder upon are: what is the governing facor -- global
divergence or local divergence? What wavelengths do you want to image at?
Is it a bio-application?

Could help you out if you are little more specific.

Sandeep