A good OH cube must be light, speedy enough, and doesn't create a lot of vibration/bumpiness when you turn it.
The DaYan and A2 are very speedy and light, but the bumpiness makes it hard to control for an OH cube. You could try the Alpha III-SV, it's very light, speedy, and smooth. And if you are good at tuning cubes, you could also try the Haiyan, which I think is the Ideal OH cube, except it's just too expensive.