sorry to not directly address your question; i think it's more important to consider which school offers a better quality of education and international reputation instead of which school is easier from which to graduate.
UNSW is internationally famous.
the moment you say you're a graduate of a caribbean school, well, you know what people will think...it's something you'll have to deal with for the rest of your career. i don't doubt their graduates are fully competent, but you must be prepared for the unfair judgement by others. if you can deal with that, by all means go for it.