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AIUI you'll burn roughly the same amount of fat in each of those zones, you'll just use more glycogen the higher the intensity.
The reason the lower intensities are better are because (a) it's easier, but (b) most importantly, by not depleting your glycogen stores as much you're less likely to over compensate with food afterwards.
Greenbank
hippy
Is exercising in the 'fat-burn zone' legit or bollocks?
Over an hour on the turbo, maintaining an average HR in Z3/4/5 my work done will be 500/700/850 kJ respectively. Obviously I'm burning more calories with the greater effort, is there any truth in the suggestion that lower intensity will get rid of fat quicker? Am sceptical.