I've used both Kingsford and several types of lump in my WSM. Kingsford is stable, but is ash-heavy which can lead to the ash choking out your fire, thus the "stir the coals." I've used regular lump, which I agree is a bit quicker burning and a little harder to control temperature-wise. I recently tried some "Wicked Good" lump which is much denser than even Kingsford. It was extremely stable temperature wise, though a bit hard to get lit, and produced little ash. It's similar to the coconut lump which I haven't tried yet, but am looking forward to. Big drawback with these though is price. Anyway, my plan is to use Kingsford for most smoke due to cost and few drawbacks, but will use the fancy lump for those "special occasion" smokes or if I know I'm going to be smoking for over around 12 hours straight to avoid ash problems.
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