If you only smoke by yourself then i would get the KM. If you have a bunch of people over when you're smoking, then go with the Mya. With that Mya, you can buy hose adapters for it and add up to 4 hoses. I personally have 2 Myas setup like that.
The Mya I have is this one: http://shop.gothookahs.com/product.s...&productId=233
One is dark blue, and the other is ruby