I like PHP's sintax more than I like ASP/Vbscript's.
I like it cuz it looks like C and I'm kinda used to it, and find it nice.
PHP is highly portable, and really speedy.
Even some Microsoft developers have been working on the PHP Windows version, and the speed is improved in windows.
Bugs [security and others] in PHP are found and fixed quickly because the code is open to lots of programmers.
PHP is really evolving.
ASP has some nice stuff that I like, and that arent in PHP, but in the end, PHP has the highest score in my book.