Gans356v2 is less likely to lock up and is never scratchy or catchy. It is probably the least likely of any cube (ever) to lock up especially if properly lubed.
Yuexiao performs very poorly if it is dry or the lube has dried up. If properly lubed it is very fast.
However, the Yuexiao is much easier to control. The Gans356v2 is extremely hard to control, mostly in the sense that turning the faces they do not tend to line up square to the cube, whereas the Yuexiao faces tend to land closer to square. So the Gans356v2 requires very clean technique and not being sloppy. Feliks obviously has no problem with it but I think a lot of people find Gans356v2 a little hard to control.
The discussion isn't complete without the Weilong GTS which most people find better than either of the above, but the weilong GTS is almost as hard to control as the Gans. Furthermore Weilong GTS and Gans are 56mm, and Yuexiao being 57mm feels much bigger in the hands.
Eric Fattah
BC, Canada