That's a long story involving power, voltage, and resistance, and the full explanation involves equations and charts.
Seriously, I'm not trying to be a ......... here, and I'll come back later and post links to both.
But the short answer is you definitely do not want a high resistance atomizer for your tornado.
If you want more vapor and throat hit you very well may like a low resistance atomizer.
Although many will tell you about potential issues using an atomizer with too low a resistance on eGo/Tornado/Riva/Inferno type
batteries.
Since I don't have those kinds of
batteries I don't get into those discussions.
But someone should come along shortly with more information.