
For reference. Looks like the bass bump is just shifted up on the AKGs. Pretty nasty 7dB spike at 9k but less of a dip at 5.5k. I imagine the AKGs will sound equally, if not more, hyped. A lot of AKG cans have cranked high end to give the appearance of detail. Some people like that, but it doesn't mean they're actually more accurate. Something like a 701 is more flat in the high end but quite a bit more expensive, and really requires an amp to get spectacular performance.
Pitting these two against each other, I'd be troubled about the jacked high end turning out dull mixes. And that big bass bump that extends high into the low mids is a problem. The frequency response from 100 to 5k is just a downward sloping line. The ATs flatten out through the mids, and the bass hump is more isolated. You actually want a bit of a bass bump in that -150hz range to compensate for the fact that you're listening on headphones, not big speakers. These are both cheap cans compared to the real standard mixing and audiophile headphones, so there's gonna be imperfection. Just comes down to the lesser of two evils. Again, I haven't heard the AKGs but I read a lot about them when I was shopping for my ATs and my interpretation of the frequency graph lines up with a lot of reviews I read about them.
Graphs aren't everything of course, but they can tell you a lot going in blind. Ideally you'd be able to hear them both at the same time with music you know well and some of your past mixes. If that's not an option then read, read, read. Make the best choice you can, given the information you have. You'll end up getting a nice set for your money regardless, and once you learn the sound of them I imagine your mixes will improve. Anything will be a step up from your current situation.