I believe that the Moyu Aolong V2 is the best 3x3 on the market. Its corner-cutting is over 45 degrees. It is very smooth and extremely fast. The world record was set by this cube, too! The one problem it has is corner twisting, which happens rarely. Pops are even rarer, thanks to its anti-pop mechanism. The Aolong, in my eyes, is unbeatable.
I believe that having a DaYan Guhong is the best speed cube for me. I think that it is because it does not pop. When I scramble it or solve it the corners will not twist like the moyu along does. I don't care what you say about it Ethan! ITS BEST!!! I don't care its the best. I'm done arguing with you.