Did you try both with your gear packed inside? That's the big test.

What about the weight of the two packs?

My personal experience with lots of pockets is that I tend to go through all of them looking for the item I want, which is inevitably in the last place I look. Your mileage, of course, may vary.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey