To my knowledge, the Caribbean medical schools all have similar levels of difficulty in terms of coursework mainly because there isn't a particularly good faculty support system for the students. This (again, from what I have read) stems from the fact that they are largely for-profit schools. This is reportedly true at lower-key schools like SABA and at the Big Three alike. This also accounts largely for why a lot of students either drop out or do poorly on STEP 1 and 2.
Do not go Caribbean. You need to be a well-above average student there to succeed, and the lack of support at those schools makes it a more difficult goal to accomplish than it is at US schools. Plus with the number of residency spots staying relatively static as the number of matriculating medical students increases, a residency crunch is already happening and will only be considerably worse by the time you graduate in 2019.
