I have all three as well as the wasp
For a restrictive lung hit, I prefer the hadalay. For a wide open deep lung hit the wasp.
The o-atty is nice and a close to the hit of the hadalay but slightly more difficult to mount a Clapton coils in. The wasp will take almost any coil; while, the hadalay will take s Clapton fine, or even a dual core fused Clapton with a little bit of patience.
Over all of the three, I would again say hadalay. But, depending on how big of a coil you want to build, you may want to take a look at the wasp.
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