josiah_roheFrom what I've *heard* the M50x has more bass than these, the AKG is more balanced (haven't personally tried either). So if you like more bass in your music, you might like the M50x more.
From a technical POV the AKG is much better though.
payodpandaThese are also open back while the ATH M50x are closed back. Which makes the AKG superior in terms of listening experience at home but the M50x is much better for portability as it won't leak out much sound.