Both are completely different natured. These HA-S500 out of the 2 has the more versatile sound. The new sony's are for guys that love their high end full big bass earphones. They have a great resolution and has some amazing mids and smooth highs to go along with the bass end. These excel at any synthetic type music with any type of authoritative bass lines. I find vocals to be angelic on them too. These are the very definition of a high end musical sound. The HA-S500 will do EDM and Hip hop perhaps not as well as the XB90 but will make up for it by being able to pick off details for Jazz and rock better. So this is what I mean by more of a versatile sound. This being said. EDM and Hip hop must be heard on these HA-S500. Not lacking one bit actually. Thanks to Danny who was the first to get the XB90. I had to get one as the idea of having a more refined CKS77 was enough to get me to bite and that is exactly what I got.