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After doing it for 30 some years, AFFF is the best. Prior post said something about corrosion but I've never seen it. We fill them by hand and get it all over including our hands with no ill effects - so far. It will also put out rubber fires including tires. I've used it on a pickup full of tires fully involved and put them out with one 2.5 gallon extinguisher - something that we would normally dump all 500 gallons in our tank and probably not get out.
Dry chem is corrosive and does as much damage as the fire - unless you have nothing else.
In a contained area, halon or CO2 work by depriving the fire of oxygen so the closed hood method would make it more effective.
I keep AFFF, CO2 and dry chem in my shop and would grab the cry chem last.
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