Teacher Discussion Forums

I am about to embark on this new career direction and opportunity, and I have the luxury of choice. Can anyone tell me if there is any real difference in the (domestic and overseas) marketplace between a CELTA certificate and a TESL Canada recognized TESOL certificate/diploma? I am also interested in the business English market, having worked in various businesses for years. Is either better for that? (I also have a B.A. in Communications).

Thanks in advance and apologies if this is not the appropriate forum.