...
On a more serious note
My absolute favorite, end of the world, highlander ("you can only have one") bong, is
Möbius Clear Matrix.
If you want something small, the ion matrix is also awesome.
High diffusion, zero drag.
They do rob a bit of flavor, but there's not many high diffusion rigs that don't rob flavor.
For high diffusion with flavor retention ime the best I've used is an M&M Tech / Leviathan lattice perc.
It's similar to a honeycomb, but offers more diffusion, more flavor, and less drag
Could be hard to find one of them now though.
I got it when the blower was active on the forums here.
Sovereignty pillars are supposed to be a great option, but I've never hit one yet...
I Can't wait to try out a cheap China version so I can get an idea of how they hit.
Recyclers are another good option to increase cooling/water conditioning the vapor without adding more diffusion...