posted 11 years ago
Both only burn the gasses. A TLUD can be made to leave the charcoal behind, or it can also burn the charcoal. Both can burn equally efficiently, any inefficiency is from lack of oxygen or loss of heat before complete combustion. Both lose efficiency as cookstoves if the pot is too close and quenches the heat before complete combustion.
It is the practical matters of how the stove was built and how it is run that matter more than the design itself in this case. Pick the style that fits your fuel availability and then work to run it well.
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