A 47" box will give a foot larger spread than a 35" box at the same distance. It will have a little more wrap. The closer the more significant the wrap will be. I don think there will be a significant difference between the two in lighting a full person, and the ability to do so is more about placement. The further away, the more even the light. You may get nominally more evenness from the 47". Size wise, the 47" should be able to be used by one person, but the 35 will probably easier.
While there will not be a huge difference either way, the 47 will have more spread/wrap at a given distance, and the 35 will be easier to handle.
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