I also think EM9 has same sonical characteristics, while EW9 is a bit warmer (could be a placebo), based on my very brief auditioning.
EM9r/d are not as edgey as EM7, but I am pretty sure they will scratch each other as well. If you insist, "r" is more rounder.
Cord of EM/EW is elastomer (synthetic rubber) and doesn't tangle easily. It's slicker so it won't fray either, I guess.
(I am too sissy to throw my EW9 in the pocket so I don't know for sure.)
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