Haiti got more exposure because the devastation was greater, and they have fewer resources to deal with it.
It isn't political, racial, yadda yadda...
Grenada's devastation was no less great, especially regarding the poor. The press barely reported it, though.
Just musing if Haiti has "liberal-favored-nation" status, and Grenada just doesn't fit their standards - are they still miffed at Reagan's intervention to kick out the leftists in Grenada, and are anxious to prop up Clinton's support of Aristede?