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Either will work (if your iPod supports firewire).

You shouldn't notice much of a difference as the available bandwidth on either port will not be utilized to full potential.
 
if you can i would us fw because in my experience fw is faster for larger transfers
(i believe it can sustain a faster speed for longer than usb)
 
Correct, but USB is not always sustained 480. It has to share it bandwith with other ports, where as FireWire has 400mbps for every single port. And it's always 400 mpbs. USB 99% of the time is going much and much slower.
 
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