Yes, the communication from SD is faster then over USB. So with high detailed models you might have some stuttering with USB while not with SD. First model I noticed it with was http://www.thingiverse.com/thing:17906
But that was a year ago, software has advanced, so it might work better now.
Only if you're currently having those problems with your PC. In my year or two of printing I've never had those problems unless I start doing something very CPU intensive at the same time as I'm printing.
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