I am no expert but I have been experimenting for a few years now.
I cook with my Natural Gas grill several days a week. I smoke as often as I can and rarely use a charcoal grill mainly because I don't own one. I do like the flavor tho.
I retired my old brinkman smoker after a few flare ups that ruined meat, I was tired of having the heat directly below my meat.
I have since been working on building a smoker the way that I want it.
I am working with a 55 gallon drum and an air tank from HF. If I could start over I would not use the drum as the metal is thin and hard to work with and weld to without burning holes through it. I will let my pictures show the timeline, it is not quite done but close.