How to debug PHP application using Eclipse PDT (xdebug and zend debugger)

Question

I'm working on one application.

I am using Eclipse php Helios IDE for developing php application.

I wanted to know below things related to this IDE, so that i can implement PHP application instantly as well as very efficiently :

1) How to do remote debugging using Eclipse PHP Helios IDE

2) What is the pros and cons of xdebug and zend debugger

3) Which debugger should we use from xdebug, zend debugger.

4) Is there any other debugger available apart from above two mentioned.

Below links i refereed for above mentioned debugger.

1) http://devzone.zend.com/article/2930-Debugging-PHP-applications-with-xdebug

2) http://www.eclipse.org/pdt/documents/XDebugGuideForPDT2.0.pdf

3) http://www.xdebug.org/

I am not getting exact information in above URL's, as I mentioned specific query above those are needed.

Is anyone know any reference, please suggest me.

Thanks !!

-Pravin