Idk, just giving my opinion here.
Neither is very good, but for the price.. this is to be expected. I just want to say that the Panasonic RP-HJE125 (a very popular and cheap pair you should be able to get at nearly any local tech store) with EQ (mostly just a huge dip at 250 and some minor corrections) sounds overall better than the KZ EDX (similar price range, has a lot of good reviews, doesn't live up to the hype imo). I tried EQing the EDX, but everything I try doesn't help much, they don't respond very well to EQing, and it's just a bit too peaky. They sound quite harsh to my taste. If you have sensitive ears I don't recommend them. To much treble, to much of everything above 3-5k, high peaks, and low end is pretty shallow, doesn't go below 20 at all and starts crackling when 50-70 is loud.. :/