what you honestly think about those.
I certainly don't listen to a lot of music like this, so take what I say with a healthy pinch of salt...
I listened to both on headphones (Beyerdynamic DT-770 Pro
studio reference headphones) and on my very average hi-fi speakers (some generic Panasonic shit
Overall, neither mix really sounds "perfect" to my ears.
Your version is a lot more raw and gritty, capturing more of the aggressive guitar tones, and arguably has a much more "punk" sound to it. It's a bit more dirty in places, but that's certainly not always a bad thing. It sounded pretty kickass overall on both headphones and hi-fi speakers.
When listening on headphones, the Artefaqt mix is unquestionably more polished in the low end and high end, but it's also lacking some of the raw energy and aggressive character in the guitars compared to your mix, since a lot of those frequencies seemed to have been EQ'ed and scooped away. On headphones the low end sounds nice and fat, but it didn't really translate well to my hi-fi speakers, so maybe wouldn't sound quite as cool on the typical average system?
I agree with @ffx in that Artefaqt seems to have applied some fairly typical off-the-shelf mastering preset here (at least at a casual glance, I'm sure more went into it). It's almost moving into what I'd expect from a drum&bass track, for example, without really considering the source material very strongly (i.e. wanting to maintain the aggressive guitars).
Just playing around in Renoise and ripping the audio from both streams, doing a bit of filtering to take aspects of each version and roughly blend them together, I actually think you could combine both versions into a really kickass hybrid, using some of the tighter low end from the Artefaqt mix, combined with the more aggressive mid-range from your version.
Or maybe you could express your concerns to the guy and try to work a bit more closely together to come up with something better.