Another vote for Arctic here.
At the moment using Pure Wings here, but wouldn't notice any issue going back for the P12.
The only point where noise would be an issue or any relevant difference would be at 70-100%.
Also where the fan is placed would affect how a fan sounds.
Let me try to explain better:
Running both the P12 and the Pure Wings 2 at same rpm (tested 50-75-100%), just loose, over the desk, the Pure Wings is much noisier. Not the fan, but the air moving, if it makes sense. The P12 is almost inaudible.
Running both at the bottom of the O11, which have quite a lot of metal, the Pure Wings is quieter, but both would be acceptable up to 40-45%, no more than that.
Same for the front of the case.
But unless the case is very limited, there won't be need to run your fans faster than 50%.
Some scenario, like my wind tunnel here (9 Pure Wings 2 120, 2 Pure Wings 80mm and 3 P12 from the AIO), increasing speed from 40% which is very quiet for my taste, to 50% won't bring any noticeable gains, only noise).