Out of the Mcfinn which I have heard great reviews about, or one that either has an ice pinch or a disc diffuser on the bottom. For those having trouble picturing the last two, think of your ice pinch bowl and disc diffused screen but for holding carbon.
The reason I ask is because in my opinion the disc diffused one should have better air flow than the mcfinn and is also cheaper. I wouldn’t mind paying extra for the mcfinn if I knew that the other two wouldn’t compare to the Mcfinn. Via (only registered users can se the link, login or register)