I didn't even know there was an MTC in Ghana. Definitely I think it's
better to be trained in the region where one will be serving, or some place
similar to it. That way the culture shock is reduced somewhat before
missionaries actually have to start preaching the Gospel. This is especially
important for those who grow up inside of the cultural Mormon "bubble"
where they are sheltered from all of the harsh realities of the outside world
all their lives. Missionary work can unfortunately sometimes be a traumatic and
testimony-destroying experience for such people.