We use frame for our international connections. The basic reasoning is the relative ease of obtaining service. It is the safe choice. Corporations have millions of dollars riding on their networks. They can't afford to take risks.
Frame relay is the best of that category.
It is an inexpensive, reliable and well-known standard. Carriers and corporations trust it. Until now, frame relay has been used most extensively for the long distance backbone. Now, we are seeing a change. You will find more and more corporations connecting to their carrier via frame relay, while other technologies form the backbone.