Both are awesome Jack.
I have the Tensile 96 and my mate has the Echo.
Both hardly skip, both are very loud the Echo is slightly louder.
Advantages of the Tensile is all moving parts are replaceable and you can take it apart, the Echo is welded shut i'm pretty sure so you can't replace anything. Tensile is also cheaper and uses a bb tool which you probably have at home. Echo's use some wierd ass 8 tab tool thing.
However one Tensile 96 already died on me and i'm on my second but I think it could have been a faulty one or something.
So pretty even. Both awesome freewheels.