I have both, and have found the opposite - once you learn how to place your fingers to hold the two flat triangles apart, they are MUCH easier to loosen than the round wire triangles. I switched to whoopie slings on my blackbird a year or two ago, and am actually thinking of buying more of the new flat buckles and switching back. It's a bit more bulk, but I do really like the "one piece" approach, where I never have to worry about whether my tree straps are big enough.
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