I've got both the sets of headphones mentioned above - 80 ohm DT770 Pro (bought 2017), and ATH-M50X (bought 2014). I have trouble finding headphones that are comfortable for me when I'm wearing them several hours a day, and both of these fit my head well, so if you're in the same boat and you like one then you'll probably like the other.
I prefer the sound of the ATs for music - I'd agree with your comment about the Beyers sounding a bit bass-light in comparison. The folding/swivel mechanism on the ATs has survived 6 years of heavy use for me without problems, and being able to switch between long/short/curly cables (or no cable, just using them to cut down ambient sound a bit) is really handy.
On the other hand, after 6 years the plastic leather on the earpads and headband of the ATs is flaking off messily, and they don't seal as well as they used to. I'd expect the Beyer design to be a bit longer-lived in this regard - but both manufacturers sell replacement bits too.