I'm not really sure what I should be looking for though in a good design for vaping.
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Those pieces all look very busy, as compared to basic designs like most Mobius pieces.
What Mobius did you get, real or Chinese?
For inverting a vape onto glass, I much prefer a center of can inlet so vape is completely balanced/ centered. None pictured have that. Not a deal breaker but these all have vape hanging off the side
Vapor starts off about 600 degrees F LESS than combusted cannabis so only minimal cooling is needed IMO. All vapor is very very dry so moisturizing the dry vapor is much more important.
So, much smaller water pieces do the job fine.
Do you prefer:
maximum diffusion for smoother vapor but more taste is lost OR
maximum taste which comes from piece with minimal diffusion but it still can add moisture OR
where in this continuum ?
I find minimal diffusion for maximum taste works great for me, but everyone is different.
I have a sensitive throat / lungs but find a small piece with minimal diffusion adds plenty of moisture to make the vapor very very flavorful and very easy on the throat and lungs.
Again--what Mobius piece and try it so you know which way to go on the diffusion vs flavor scale
EDIT: abcd, I see your Mobius piece and your aim for maximum diffusion so I cannot help as I focus completely on the minimum diffusion/ max taste pieces.
I'm sure others will have great suggestions.
vape on