Stainless steel is different than regular (clear?) steel because is is an alloy, or combination, of steel and other elements. Stainles steel has 15% chromium, which is very resistant to rust than regular steel. That is why stainless is more expensive
I think a lot of people prefer the flavor that charcoal provides. But so often, time being of the essence, propane can provide a good and speedy alternative to charcoal. When I have time, I like cooking meat on a smoker, as the flavor is unsurpassed....
18 gg means 18 gage stainless. This is the thickness/strength of the stainless.