Headphone rated impedance has NOTHING to do with sound quality; it's simply a number that reflects the physical construction of the drivers.
Going with a lower-ohm headphone will generally result in higher volume, but that's not something that anyone should be shooting for. Higher volume from the output section of your interface can degrade the ability for it to provide good sound, so keep that it mind. It depends on the output section of whatever the phones are plugged into.
Headphones are obviously not the best way to mix (or master) but could be preferred to inexpensive monitors or trying to mix in a room that has it's own problems with introducing odd response.
I'd MUCH prefer to mix on good phones, but you DO have to know how it will translate to mixes pumped out through other audio systems. The most problematic issue with headphones is going to be stereo spread and imaging issues, so just keep that in mind.
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