The DT770 will provide a sound, build, and comfort experience that’s the most like the Cloud 1’s, but a little better. The Cloud 1 is based off the Takstar Pro 80, which was itself a copy of the DT770. So I’d go with those, out of those two.
I like the M50X’s also, but they’re a bit more clampy and the pads are smaller. It might be harder to adjust to if you’re used to the way the Clouds feel.