I am so happy to report that the 6x12 DaYi back was able to hold all of it's darkness in. Even with the darkslide out.
And to add to my thoughts, the Guohuo's advance knob was really stubby and made advancing the frame very hard to do as there was really no way to get a good grasp on it with your fingers. Especially if it was left on the camera. There was also a lot of friction that added to the annoyance.
The DaYi advances so smoothly.