I've also had compatibility issues with 7200rpm USB drives - some PCs can't provide enough power for them, especially through their front USB ports so you end up having to use a power adaptor or getting supplementary power from a second USB port. As you won't be running an OS or applications off the drive, the rotation rate doesn't really matter - its primary effect is on random access time. It's also from WD, which on its own would decide the matter for me were I to be offered a choice between these two - I've never heard of G-Tech and I don't know whose drives they use or what their support is like. It wouldn't surprise me if it has faster transfer rates than the G-Tech one simply by virtue of its higher density.
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