My perspective is that I want the TQ to be a good fit lengthwise. I don't want extra material bunching up as I wrap the top end around my shoulders, which seems to make a wall of quilt material on top that catches my breath. And for similar reasons, wouldn't want to be pulling a quilt over my head.
My experience with HG is they give about an inch or two consideration in their lengths, so you should be good with the short. Worth a call to them to see what they recommend as I don't have experience with the Econ quilt.
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