Depends on how you Vape. Some devices are designed for big lung inhales (mostly for the cloud chasers I think) while others demand a slower mouth only draw. I like the mouth draws personally... I over nic with big lung inhales, and I don't enjoy as much if the flavor.
To your question though, others hit the nail in the head. It's a balance of power, air, vacuum, etc.
If you are on a cig a like, get an ego setup. A lot of people like carto tanks, I loved my Vivi nova and my evods. They are about the same cost as a cigalike (though aesthetically different obviously), but you will have a much better vaping experience.
Good luck!
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