I hop back and forth between various small alcohol stoves and Esbit tabs for hiking. To be honest, there is not much difference weight-wise on anything but the longest trips.
I use one Esbit tab (.5 oz) to boil two cups of water, and about .4 oz of alcohol to do the same. So, if you cook twice a day and are out for 80 days (and measure more carefully than me) you'll save a pound! Each has it's advantages, assuming other factors are the same (lidded pot, windscreen, etc.)
Smell: alcohol wins. Every kind has additives, but none of it smells as bad as Esbit.
Mess: alcohol wins again. Some small sticky spots occasionally, but nothing like the mess Esbit makes.
Storage: Esbit wins. I leave it in my kit all the time without worrying about leaking, evaporation, or ignition.
Ease of use: tie. Esbit tabs are a pain to light, and alcohol stoves need measuring and pouring and priming. With just a bit of practice it all becomes second nature. Alcohol does create less trash to carry.
Adaptability for cooking: alcohol wins. If a recipe needs more than 2 cups, I can adjust a bit. It won't boil quarts of water at a time, though. The burn time for .4 oz. is about the same as an Esbit tab, but doubling that does not give you double the time. It's longer, yes, but you also get BIG flame blasting up alongside the pot (and weird looks from fellow campers) which blows your efficiency. They are optimized for the 2 cup burn, but 3 is within reach.
Other uses: Esbit wins. It's a fantastic fire-starter.
Brightness: alcohol is not bright at all. In fact the flame is invisible in daylight. Wave your hand well above the stove to see if it's lit.
I've used the Photon style of Pepsi-can stove for years because I know Photon. He measures the hyphen in anal-retentive, so I know that he's done everything possible to make the best possible stove, including trying to get it to blow up (without success). They are also fun to make. Recently I've been unfaithful with the White Box Stove (use Ebay), which really works well and saves weight due to no need for a pot support.
This is alky stove central:
http://zenstoves.net/Stoves.htmHope this helps.
Jaywalke