Pls, can anybody point a better one out of PHP / JSP also JAVA / DOT NET. Pls back up your answers with good point

What is the problem at hand?

you want to write new OS, Game, Graphic manipulation app, Drivers, use C/C++
you want mobile app? use Java
you want desktop based GUI, consider VB/C# or Delphi
You want to web app, consider PHP, Python or Ruby
You want to create new Virii baby, use TASM, MASM (Assembly)
For general hacking stuff, use Python.

for ERP use Java