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If you're planning on living and working as a divemaster in a certain location, get your training there. Especially in areas with multiple sites on islands, channels, currents etc. get to know the area, as well as dive shops that you might work for.
Where to go to get DM training depends on what you want to do with the training after you get the certification. Four popular options: (1) necessary step on the way to becoming an instructor; (2) necessary step on the way to becoming a dive guide; (3) just want to help instructors with classes; and (4) personal enrichment. I can't tell from the OP's post which of these (if any) is/are applicable, although (4) sounds more likely than the others. If the reason indeed is (4), then just go wherever you'd like to spend some time. If the reason is (3), then you want to go to a place with lost of instruction going on, at all different levels. If (2), then go to a place where you'd like to be a dive guide (fif the country allows it). If (1), then go to the place where you'd like to be an instructor. Note that many "dive guides" are also instructors, and they will preferentially get the jobs, because they can do more hence are more valuable.