Difference between TESOL vs TEFL? Please help.

I'd like to teach English abroad but while i have teaching experience and am licensed I do not have a TESOL or TEFL? I am considereing attaining one or the other but before I do I'd like to know which certification would give me the better edge in the candidacy pool. I'd love to hear from people that are certified in either or from a recruiter. What is the difference between the TESOL and the TEFL? Which is more lucrative to have when trying to teach abroad? Also, I just realized that you can attain a TEFL certificate for either 100, 120, or 150 hours? What would be the difference between a 100 hour vs the 150 hour? I'm assuming the 150 hour is preferred, but are there programs that require a minimum? Are they expensive and/or time consuming to achieve? Which should I attain in order to teach abroad? 

Thanks!

HOLLY

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