LD

Hey guys, I'm currently trying to choose between the Drobo S and the Promise DS4600. The DS4600 is way cheaper so that's an advantage Anyway, the raid's purpose for me would be to serve as my main storage for photography, which means I need it to be very fast so I can access my photos with no hiccups. I am a Mac user and I thought about connecting it using Firewire 800. Do you think the Promise would be fast enough for this purpose? What about the Drobo S? Thanks!