I have 3 out of the 4.
[Caveat: I like fast and loose cubes, so my preference is largely influenced by this]
Gans 356 - great with corner cutting and pop proofed. But I find it a bit 'draggy' and experience a bit catching if I set it too loose. Great for those who likes slower (still fast for some), and tighter cubes
Hualong - the corner cutting is fantastic and I don't have any lock ups with it. Fast cube but will pop if you are too aggressive or set it a bit loose.
Yuxin - draggy and tight without CX3 springs. Nice with soft springs but I find the reverse corner cutting is affected. To circumvent this, I need to really set loose tension, which makes the cube really fast. May be uncontrollable for some at this tension. I just ordered another one (white)
Each of these have different turning feel with the gans (on tighter tension) having the most delightful feel. I like the hualong because of its superb corner cutting and the absence of any catches. I am alternating these 3 but hualong and yuxin gets my vote.