Xiao Bai Tu: Should I use EAD?

Xiao Bai Tu:

Maybe it is an old question, could you help to answer.

My H1B is approved and will start from October 2006. My OPT will expire on August 31 2006. I just got notice that my EAD(come with my 485 application) is also approved this week.

Can I use this EAD during September? If I use EAD, my H1-B will be cancled or not? What is the pros and cons for using EAD vs. H1-B.

I know it is an old qeustion, could you answer or point to where I could find the answer.

Thanks a lot.