I own the Moodrop Chu, 7Hz Salnotes Zero, and the original Truthear x Crinacle Zero. I also own the Truthear Hola, QKZ x HBB Khan, and ordered the KZ PR2 recently.
One channel of the Chu stopped working after just a few months of use, probably because of the cable which isn't removable. I wasn't a fan of its treble anyway so even though it is cheap, I wouldn't say it has the best bang for the buck.
The Truthear Zero is great, my favorite sounding of the bunch. I like it with the included foam tips and I think the cable and carrying bag are the best out of any of these others.
With that being said I voted for the 7Hz Zero. The tips and cable are meh and there is no case. No deep bass rumble like the Truthear Zero either. But they sound very neutral, not lacking in detail, not distorted, they just put out clean natural sounding music. For half the price of the original Truthear Zero, I think they are the Bang for the Buck kings.