I would go for the sennheisers. I have both, and while I'm a fan of the koss sound, I like the px100-II for their added comfort and stronger bass which comes in handy for rock. You can't go wrong either way. I prefer the portapro drivers on the ksc75 clip-ons as the separation created by the clip-ons make them sound a bit better.
4/11/14 at 1:49pm