Do you have to do it online? If you are planning just to use the cert for travel and to stay there for a while, then fine, but if you might want to continue, then I would recommend getting a certified course that has international recognition and includes teaching practice. The problem with these online courses is that they are largely unregulated and many use dubious recognition, so the course might not be much use in the long-term. Of the two, INTESOL looks as if it has better accreditation (multiple and including the College of Teachers). Before choosing any online course, I would recomment looking very carefully at accreditation, and would go as far as to do a Whois search on them- you will find that some accrediting boards share the same address as the online provider, which means they should be avoided as they are recognising their own certificates, which almost certainly means that no one else will.