One of the great things about owning your own equipment is the luxury of experimenting.

Put together a short scene then export and import it using several different settings using both cables. And I think you can answer your own question about quality - I'm sure (even with experimenting) you know that setting the resolution to low or minimum won't be as good as "max".

And don't forget to try firewire - also called iLink and IEEE 1394. In my opinion that's the best way to transfer digital video.

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The aim of an argument or discussion should not be victory, but progress.
Joseph Joubert, essayist (1754-1824)

I dont know much about that IEEE 1394

I have a USB connector on my motherboard. If I bought a cable would it work?? Or do I need a IEEE 1394 board?

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Yes, you'll need a Firewire/IEEE1394 card. But they're pretty much free these days :).