Do you really care about audio quality that much when you’re out running? You’re not exactly in an ideal listening environment, and whatever bud type headphones you’re wearing won’t be able to accurately reproduce bass anyway.
If you've got recommendations I'm all ears!
I will personally throw this in the "it depends" category. I've had a pair of IEMs which reproduced bass as well as my 3' tall speakers (with dedicated bass, mid, and treble cones).
Sure, my ass wasn't being shaken with the IEMs, but the low level details were there.
It's only around 20-25db of isolation, so unless you really have your music cranked, you can still typically hear vehicles (and can definitely hear horns).
I know a few people who love IEMs for exercising (including running), since they pretty much never fall out unintentionally. You can't even really pull them out by the cord.