FireWire 800 vs USB 3?

When using an external hard drive RAID which connection will provide the best performance for VIDEO EDITING?
I know USB 3 has up to 5Gbits/s but is it the best option when editing video?

Since your iMac dosen't and will not do USB 3.0, why do you need to know this?
Because I am looking at purchasing another external hard drive and the one I was looking at [1TB RAID 0 (performance stripe)] does not have USB 3, just eSATA, FW800, FW400 and USB 2.0. Then there was another, non RAID, hard drive that has USB 3 in addition to the other connections.
Mercury Elite Pro Performance 7200RPM RAID
OWC Mercury Elite Pro
I am trying to decide between the two and just preparing for when I update my desktop in the next couple years.
I looked at Thunderbolt Drives as well as SSD but being a student in college, I can not afford either of those options right now.

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    Message was edited by: Spy x

    Hi Tom, thank you for your reply. Although I had read these threads, today I tried many things from what these says but without success. Then I read to a thread here that the Unknown Device at my System Profiler exists to every Mac G5 dual or quad core at Firewire tab. So this query goes out but my problem exists.
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