No Trinidad was not better as a republic of Britain for the fact that seem widely successful as their own country. They have their own way of life and by being separate from Britain they are able to maintain their own style and do not have to fear the wrath of British law being enforced on them.
With imperialism long gone and most regions having their own government, it is outdated to have a country like Trinidad belonging to a country on the other side of the world like Britain. It is not possible for one country to understand and handle the issues of a location that far away with so many cultural differences with the efficacy that a local government could, and it is unfair to deprive any region of independence. Trinidad needs to be free to handle their own government, finances and infrastructure without interference from another continent.