If you do both regularly it probably won't make much difference.
But, if you're going to do one right after the other, vacuum first and then brush. Brushing will stir up and suspend, at least briefly, the dirt that settles to the bottom of the pool, preventing you from vacuuming it up unless you wait for it to settle again (though some of it will be picked up by the skimmmers and drains before it has a chance to foul the bottom again).
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