I prefer singles, but saying that, I also enjoy the challenge of building a single coil that will match the vapor production and flavor of duals. I had a doge v2 that I ran in single mode with a clapton on a istick 30w. I got just as much vapor and flavor as many people that I met in the vape shop. Most people don't believe it is possible to do that. I love to see the look of disbelief on their face when they see it's a single coil at such low power. It's all in how you build.
There are two things that makes clouds.
1. A good build
2. High VG Ejuices.
I prefer 70/30 e juices