My tip so far is that the dual coil is much easier to wick and make leak proof than the single. Also expect a slight dribble from the bottom airflow after a refill so give it a minute or two before mounting it on the mod.
Also be prepared to be blown away by the coil that comes on the single coil deck it looks like a dual core Clapton with another spaced layer of ribbon wire, absolute beast, it wicks better than my 4mm parallel coil I had installed.
Also be prepared to be blown away by the coil that comes on the single coil deck it looks like a dual core Clapton with another spaced layer of ribbon wire, absolute beast, it wicks better than my 4mm parallel coil I had installed.