One of the key elements of building a Rohloff hub is that the large flange diameter means the spokes enter the rim at a very steep angle. Some spoke are better than other at coping with these angles, and while I’ve felt this difference I’d never measured it before. So out of curiosity I did this quick test:
An old rim was clamped to the bench on top of a sheet of A3 paper. This particular rim is an old American Classic CR350 which should be representative of most rims.

I used a big ol’ hunk of aluminium square bar to hook the spoke’s end and keep it straight.

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Using a sharp pencil I scribed a line along the paper.

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Then using a protractor did my best to measure the angles.
Ladies and Gentleman: your podium

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1st: Wheelsmith with 19 degrees included angle.
2nd: DT Swiss with 15 degrees
3rd: Sapim with 14 degrees
Not a perfect scientific test but it backs up what I felt from using each of these nipples.