I think it also depends on what you're doing with your hose.
If you have a situation like Sambooka's, where you and your girlfriend are the only ones smoking your single hose type hookah on a regular basis it's great to get a KM set. You can get a few so you have one for each flavor type.
If you have a situation more like mine, where you always have 4 hoses plugged in, and usually 5 or more people using it, you want nammor/razan's that you can wash. That way you can wash the nasty people germs off. Also when you have to use that many hoses it is not economically viable to have hose sets for different flavors, you need to be able to wash that AF Cappucino flavor out.
Altogether any of these hoses are good, and will serve you well. It comes down to use, personal style, and preference..