There are plenty of threads in this forum re: pros and cons of Esbit versus alcohol.
I think the best thing is to try both methods and see what suits you best. If you can handle the blackened pot bottom, fishy smell, extra cost and fiddly ignition of the Esbit then it can be more fuel efficient and handier to carry. Alcohol is less efficient (but not by much), can spill and contaminate your pack or catch things on fire, requires a special container to carry it, and also smells bad, though not as bad as Esbit. It is cheaper and easier to find, but you need a decent stove to burn it in. The Esbit just needs a small stand.