Are there any benefits of using one Iridium World Data Service over the other?

Each of Iridium's Data services fills a specific need and which one you select should be based on your application. If you are attempting to dial into a corporate LAN or a specific Internet Service Provider (ISP), Iridium's Dial-Up service is most appropriate for your needs. If, on the other hand, you are interested in referencing web sites or using email, then Direct Internet may be the better option. Both services are enabled so long as you have Data on your account. Both services and co-exist on the same machine without any difficulty.