Another TESOL vs CELTA Post

OK,
I have done the rounds looking at forums regarding teaching english as a second language and cannot for the life of me come to a decision about which course to do.
I will tell you a little about my situation and hopefully one of you lovely people can help me out.
I have taught English in France to adults and students for the last year or so. I have a TEFL qualification other than that I come from an IT Background. My husband is French therefore I am legal to work in France (just mentioning that there are no problems work visa wise). I am in the process of trying to decide which course is more recognized in France by Training providers. So basically TESOL or CELTA. Which one?
As a secondary question (if you haven't tuned out yet) what would I need to do to be able to teach english as a second language to migrants in Australia? I am an Australian who is now in Australia for a year or 2 before going back to France with my husband (we're here on a long holiday) I have heard you need to complete some sort of TESOL qualification to teach english in Australia.

Any information would be greatly appreciated.
Regards