Yeah. For raw fuel we are talking.
After adding in for a fuel bottle it is slightly less weight, overall. But, it is not that big of a differance... hundreths of an oz.
From Heat of Combustion at Wikopedia:
100% Ethanol is 12800BTU per pound
Hexamine is 12900BTU per pound (Trioxane is fairly similar but burns slower)
After computing eutectics at 95% and the weight of a fuel bottle esbit is better, but esbit also does not burn cleanly. It produces soot and by products. It looses efficency at about the same rate, maybe a bit less. The tables assume complete combustion.
Over all, the difference between the two is mostly a matter of choice. The slower heat, set to the perfect height will give slightly better results than alcohol. At
a different air temperture, it might burn more becasue it heats too slowly, allowing heat to radiated away from the water at a faster rate. Anyway, for between 40F and 70F it isn't significantly different...maybe as much as .1oz.
My tests pretty much follow this. I could not isolate the exact distance at which esbit was optimal, not enough tablets. And I suspect that this would vary with the air temp anyway. Like alcohol, there is a sweet spot, but it is much narrower since the amount of heat is much less.
I HAD expected them to be much better. I only looked up the heat of combustion figures after the test runs because I thought I must be doing something wrong. I had assumed that they were around midway between WG and alcohol and was surprised that I could not get them to burn better. I should know better...but, it still surprised me.
Anyway, I dropped them becasue they really don't buy me enough to be worth it.
They are quite wind sensative. I often loose more than I gain. Soo, after 7-8 trips out, I just quit using them. I have several packs of fuel tabs here now, actually.