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Personally I would choose the 21 Ethos over either of those in your scope. It gives the ideal 2.1mm exit pupil. Which is pretty much the perfect exit pupil for hunting galaxies but also for general deep sky objects. ~2mm exit pupil is ideal due to its balance of surface brightness and contrast/darker sky background.
That being said. For the cost of 1 Ethos 21, consider the Explore Scientific 14mm and 20mm 100 degree eyepieces. At a gentle F10 they perform brilliantly. I've tested and Ethos 13 and ES14 in a C11 both Edge and non Edge and they are sensibly identical.
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